[SL-ONLY] Add Matter+AWS documentation

docs/platforms/silabs/silabs_matter_aws_build_guide.md

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+# Build Procedure For Matter AWS
+
+## Build command with Matter AWS
+
+-   To enable Matter AWS functionality use the `enable_matter_aws=true` flag.
+
+````
+
+### Here is an example to build the lighting-app with Matter AWS for the SiWx917 SoC
+
+```shell
+./scripts/examples/gn_silabs_example.sh examples/lighting-app/silabs/ out/debug BRD4338A enable_matter_aws=true chip_enable_wifi_ipv4=true
+````
+
+## Compile using new/different certificates
+
+-   Two devices should not use the same Client ID. Use a different Client ID for
+    your second connection.
+-   While using AWS, Change the following:
+    -   Add your AWS certificates in file
+        `examples/platform/silabs/matter_aws/matter_aws_interface/include/MatterAwsNvmCert.h`
+        -   Provide the AWS Root CA key
+            (https://www.amazontrust.com/repository/AmazonRootCA3.pem)
+        -   provide device_certificate and device_key with your device cert and
+            device key. Refer
+            [Openssl Device Certificate Creation](#matter--aws-device-openssl-keys-generation)
+    -   Add your AWS server and Client ID in file
+        `examples/platform/silabs/matter_aws/matter_aws_interface/include/MatterAwsConfig.h`
+        -   Provide `MATTER_AWS_SERVER_HOST` with your AWS Server name
+        -   provide `MATTER_AWS_CLIENT_ID` with your device/thing ID
+-   The preferred certificate type to use in the application is ECDSA.
+-   AWS RootCA used in this PoC is
+    https://www.amazontrust.com/repository/AmazonRootCA3.pem
+
+## Matter + AWS device openssl keys generation
+
+## Openssl Installation (In ubuntu 22.04)
+
+1. To install openssl (v 3.0.2) - `sudo apt install openssl`
+
+## Certificates Creation
+
+The following commands are used to generate certificates:
+
+1. To generate Client key:
+    - `openssl ecparam -name prime256v1 -genkey -noout -out device.key`
+2. To generate Client certificate (ex: `device.crt` and `device.key`) using CA
+   certficate:
+    - `openssl req -new -out device.csr -key device.key`
+3. While creating AWS thing , use Upload CSR option in configure device
+   certificate step. once uploaded the CSR generated in step 2. AWS will
+   generate AWS CA authenticated device.crt.
+   ![AWS CSR Upload ](./images/matter_aws_device_csr_certificate_generation.png)
+
+Repeat step 1 and 2 to create an additional set of certificate to use in MQTT
+explorer (ex: `explorer.crt` and `explorer.key`). (Create with different name
+for Identification)

docs/platforms/silabs/silabs_matter_aws_guide.md

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+# Matter Wi-Fi + AWS Component
+
+-   Matter+AWS is a silabs only feature to connect matter devices to proprietary
+    cloud solutions(AWS,GCP,APPLE ...) directly. As such, a Matter Wi-Fi device
+    must support connecting locally on the Matter Fabric, via IPv6, and
+    connecting to the Internet via IPv4.
+-   Matter devices can be controlled by chip-tool or controller and the
+    respective status of the attribute modified will be published to the cloud.
+-   Remote user can install the cloud specific application to get the
+    notification on the attribute status.
+
+## Matter + AWS Feature Diagram
+
+1. Below diagram gives end-to-end flow about Direct Internet Connectivity.
+
+![Silicon Labs - Matter + AWS design](./images/matter_aws_flow.png)
+
+## Prerequisites
+
+### Hardware Requirements
+
+For the list of hardware requirements for Matter + AWS feature , see the
+official
+[Silicon Labs Matter HW requirements](https://siliconlabs.github.io/matter/latest/general/HARDWARE_REQUIREMENTS.html)
+documentation.
+
+### Software Requirements
+
+For the list of software requirements for Matter + AWS feature , see the
+official
+[Silicon Labs Matter Software requirements](https://siliconlabs.github.io/matter/latest/general/SOFTWARE_REQUIREMENTS.html)
+documentation.
+
+## End-to-End Set-up bring up
+
+## Message Queuing Telemetry Transport (MQTT)
+
+-   MQTT is an OASIS standard messaging protocol for the Internet of Things
+    (IoT). It is designed as an extremely lightweight publish/subscribe
+    messaging transport that is ideal for connecting remote devices with a small
+    code footprint and minimal network bandwidth. Refer https://mqtt.org/ for
+    more details
+
+### Building Matter Matter + AWS Application
+
+1. To Build Matter + AWS Application, refer
+   [Building of Matter + AWS](./silabs_matter_aws_build_guide.md)
+2. Commission the Matter Device and confirm Matter + AWS connection is done from
+   Device side logs.
+
+## End-to-End Test of Matter + AWS Application
+
+-   **Sharing status of device to cloud**
+
+    -   Below diagram gives end-to-end flow for sharing status from matter
+        device to cloud
+
+        ![Silicon Labs - Matter + AWS design](./images/matter_aws_status_flow.png)
+
+**Note**: For reference, Lighting App commands given in the above image.
+Similarly other application commands also can be passed. - End-to-end command to
+be executed from chip-tool, refer
+[Running the Matter Demo](RUN_DEMO.md#demo-execution---commissioning-a-wi-fi-device-using-chip-tool-for-linux) -
+Below is the application specific attribute/s information or state shared to the
+cloud through Direct Internet Connectivity Solution - For Lighting App, On/Off
+Attributes - For Lock App, lock/unlock Attributes - For On/off Plug App, On/Off
+Attributes - For Windows App, lift/tilt Attributes - For Thermostat App,
+SystemMode/CurrentTemp/LocalTemperature/OccupiedCoolingSetpoint/OccupiedHeatingSetpoint
+Attributes - Application status would be updated on the mqtt_explorer UI, as
+shown in below image.
+
+![Silicon Labs - Matter + AWS design](./images/matter_aws_mqtt_explorer.png)
+
+-   **Control of the device through cloud interface**
+    -   Below diagram gives end-to-end flow for Control of the matter device
+        through cloud interface
+        ![Silicon Labs - Matter + AWS design](./images/matter_aws_command_flow.png)
+
+**Note**: For reference, Lighting App commands given in the above image.
+Similarly other application commands also can be passed.
+
+-   Make sure matter device is up and commissioned successfully, refer
+    [Running the Matter Demo](RUN_DEMO.md#demo-execution---commissioning-a-wi-fi-device-using-chip-tool-for-linux)
+-   For Controlling the device, set topic name and the commands to be executed
+    in the mqtt_explorer for below applications.
+    -   Lighting App
+        -   Topic: command
+            -   Commands:
+                -   toggle
+                -   on
+                -   off
+    -   Onoff-plug App
+        -   Topic: command
+            -   Commands:
+                -   toggle
+                -   on
+                -   off
+    -   Lock App
+        -   Topic: command
+            -   Commands:
+                -   lock
+                -   unlock
+    -   Thermostat App
+        -   Topic: command
+            -   Commands:
+                -   SetMode/value(value need to provide 1,2,3,4 ex:SetMode/1)
+                -   Heating/value(value need to provide 2500,2600
+                    ex:HeatingSetPoint/2500)
+                -   Cooling/value(value need to provide 2500,2600
+                    ex:CoolingSetPoint/2500)
+    -   Window App
+        -   Topic: command
+            -   Commands:
+            -   Lift/value(value need to provide in range 1000 to 10000 ex:
+                Lift/2500)
+            -   Tilt/value(value need to provide in range 1000 to 10000 ex:
+                Tilt/2500)
+-   Then click `publish` button to execute the command.
+
+    ![Silicon Labs - Matter + AWS design](./images/matter_aws_cloud_control_mqtt_explorer.png)