[azure-data-transfer] Adding new extension for azure-data-transfer and commands within the extension. (#8854)

* Adding azure data transfer commands

* Taking review comments

* Fixing build failures

* Removing the duplicate name azure from the commands

* Adding the read me file

Author: lasuredd-msft

src/data-transfer/HISTORY.rst

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+.. :changelog:
+
+Release History
+===============
+
+1.0.0b1
+++++++
+* Initial release.

src/data-transfer/README.md

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+# Azure CLI automation Extension #
+This package is for the 'azure data transfer' extension, i.e. 'az data-transfer'.
+
+### How to use ###
+Install this extension using the below CLI command
+```
+az extension add --name data-transfer
+```
+
+### Included Features
+#### Viewing Pipelines:
+Manage Connection: [more info](https://learn.microsoft.com/en-us/azure/templates/microsoft.azuredatatransfer/pipelines/)\
+*Examples:*
+
+##### Get a pipeline
+
+```
+az data-transfer pipeline show \
+    --resource-group groupName \
+    --pipeline-name pipelineName
+
+```
+##### List all pipelines in a subscription 
+
+```
+az data-transfer pipeline show --resource-group groupName
+
+```
+
+```
+az data-transfer pipeline show
+
+```
+
+##### Approve a connection in a pipeline
+
+```
+az data-transfer pipeline approve-connection \
+    --resource-group groupName \
+    --pipeline-name pipelineName \
+    --connection-id connectionResourceId
+
+```
+
+##### Reject a connection in a pipeline
+
+```
+az data-transfer pipeline reject-connection \
+    --resource-group groupName \
+    --pipeline-name pipelineName \
+    --connection-id connectionResourceId
+
+```
+
+#### Connection Management:
+Manage Connection: [more info](https://learn.microsoft.com/en-us/azure/templates/microsoft.azuredatatransfer/connections/)\
+*Examples:*
+
+##### Create a receive side connection
+
+```
+az data-transfer connection create \
+    --resource-group groupName \
+    --name connectionName \
+    --location westus \
+    --pipeline PipelineName \
+    --direction Receive \
+    --flow-types Api Data \
+    --remote-subscription-id subscriptionId \
+    --justification 'justification string' \
+    --requirement-id 1234 \
+    --primary-contact [email protected] \
+    --secondary-contacts [email protected]
+
+```
+##### Create a send side connection
+
+```
+az data-transfer connection create \
+    --resource-group groupName \
+    --name connectionName \
+    --location westus \
+    --pipeline PipelineName \
+    --direction Send \
+    --flow-types Mission Data \
+    --pin 123456\
+    --primary-contact [email protected] \
+    --secondary-contacts [email protected]
+
+```
+
+##### Link send and receive side connections
+
+```
+az data-transfer connection link \
+    --resource-group groupName \
+    --name receiveSideConnectionName \
+    --pending-connection-id sendSideResourceId
+
+```
+
+##### List connections in a resource group
+
+```
+az data-transfer connection link \
+    --resource-group groupName \
+    --maxItems 10
+    --nextToken <Link from previous response>
+
+```
+
+##### List pending connections that can be linked with the given connection
+
+```
+az data-transfer connection list-pending-connection \
+    --resource-group groupName \
+    --name receiveSideConnectionName \
+    --maxItems 10 \
+    --nextToken <Link from previous response>
+
+```
+
+##### List pending flows in the given connection that are not linked
+
+```
+az data-transfer connection list-pending-flow \
+    --resource-group groupName \
+    --connection-name receiveSideConnectionName \
+    --maxItems 10 \
+    --nextToken <Link from previous response>
+
+```
+
+##### Get the given connection
+
+```
+az data-transfer connection show \
+    --resource-group groupName \
+    --connection-name connectionName
+
+```
+
+##### Update the given connection
+
+Update of the tags is only supported.
+
+```
+az data-transfer connection update \
+    --resource-group groupName \
+    --connection-name connectionName \
+    --tags key1=update1
+
+```
+
+#### Flow Management:
+Manage Flow: [more info](https://learn.microsoft.com/en-us/azure/templates/microsoft.azuredatatransfer/connections/flows/)\
+*Examples:*
+
+##### List flows in the given connection.
+
+```
+az data-transfer connection list-pending-flow \
+    --resource-group groupName \
+    --connection-name receiveSideConnectionName \
+    --maxItems 10 \
+    --nextToken <Link from previous response>
+
+```
+
+##### Create a flow
+
+```
+
+az data-transfer connection flow create \
+  --resource-group resourceGroupname \
+  --connection-name connectionName \
+  --name flowName \
+  --flow-type "Mission" \
+  --location eastus \
+  --status "Enabled" \
+  --storage-account strorageAccountResourceId \
+  --storage-container-name testContainer \
+  --data-type "Blob" 
+
+```
+
+##### Link send and receive side flows
+
+```
+az data-transfer connection link \
+    --resource-group groupName \
+    --connection-name receiveSideConnectionName \
+    --name receiveSideFlowName \
+    --pending-flow-id sendSideFlowResourceId
+
+```
+
+##### Get the given flow
+
+```
+az data-transfer connection flow show \
+    --resource-group groupName \
+    --connection-name connectionName \
+    --name flowName
+
+```
+
+##### Enable the given flow
+
+```
+az data-transfer connection flow enable \
+    --resource-group groupName \
+    --connection-name connectionName \
+    --name flowName
+
+```
+
+##### Disable the given flow
+
+```
+az data-transfer connection flow disable \
+    --resource-group groupName \
+    --connection-name connectionName \
+    --name flowName
+
+```
+
+##### Update the given flow
+
+Update of the tags is only supported.
+
+```
+az data-transfer connection flow update \
+    --resource-group groupName \
+    --connection-name connectionName \
+    --flow-name flowName \
+    --tags key1=update1
+
+```
+
+If you have issues, please give feedback by opening an issue at https://github.com/Azure/azure-cli-extensions/issues.

src/data-transfer/azext_data_transfer/__init__.py

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+# --------------------------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for license information.
+#
+# Code generated by aaz-dev-tools
+# --------------------------------------------------------------------------------------------
+
+from azure.cli.core import AzCommandsLoader
+from azext_data_transfer._help import helps  # pylint: disable=unused-import
+
+
+class DataTransferCommandsLoader(AzCommandsLoader):
+
+    def __init__(self, cli_ctx=None):
+        from azure.cli.core.commands import CliCommandType
+        custom_command_type = CliCommandType(
+            operations_tmpl='azext_data_transfer.custom#{}')
+        super().__init__(cli_ctx=cli_ctx,
+                         custom_command_type=custom_command_type)
+
+    def load_command_table(self, args):
+        from azext_data_transfer.commands import load_command_table
+        from azure.cli.core.aaz import load_aaz_command_table
+        try:
+            from . import aaz
+        except ImportError:
+            aaz = None
+        if aaz:
+            load_aaz_command_table(
+                loader=self,
+                aaz_pkg_name=aaz.__name__,
+                args=args
+            )
+        load_command_table(self, args)
+        return self.command_table
+
+    def load_arguments(self, command):
+        from azext_data_transfer._params import load_arguments
+        load_arguments(self, command)
+
+
+COMMAND_LOADER_CLS = DataTransferCommandsLoader