Add CloudStorageEmulatorContainer and PubSubEmulatorContainer to gcloud module (#805)

Author: weyert

docs/modules/gcloud.md

@@ -8,12 +8,15 @@ Testcontainers module for the Google Cloud Platform's [Cloud SDK](https://cloud.
 npm install @testcontainers/gcloud --save-dev
 ```
 
-Currently, the module supports `Firestore` emulators in Native mode and Datastore mode. In order to use them, you should use the following classes:
+The module now supports multiple emulators, including `firestore`, which offers both `native` and `datastore` modes.
+To utilize these emulators, you should employ the following classes:
 
 Mode | Class | Container Image
 -|-|-
-Native mode | FirestoreEmulatorContainer | [gcr.io/google.com/cloudsdktool/google-cloud-cli:emulators](https://gcr.io/google.com/cloudsdktool/google-cloud-cli)
-Datastore mode | DatastoreEmulatorContainer | [gcr.io/google.com/cloudsdktool/google-cloud-cli:emulators](https://gcr.io/google.com/cloudsdktool/google-cloud-cli)
+Firestore Native mode | FirestoreEmulatorContainer | [gcr.io/google.com/cloudsdktool/google-cloud-cli:emulators](https://gcr.io/google.com/cloudsdktool/google-cloud-cli)
+Firestore Datastore mode | DatastoreEmulatorContainer | [gcr.io/google.com/cloudsdktool/google-cloud-cli:emulators](https://gcr.io/google.com/cloudsdktool/google-cloud-cli)
+Cloud PubSub mode |PubSubEmulatorContainer | [gcr.io/google.com/cloudsdktool/google-cloud-cli:emulators](https://gcr.io/google.com/cloudsdktool/google-cloud-cli)
+Cloud Storage mode |CloudStorageEmulatorContainer | [https://hub.docker.com/r/fsouza/fake-gcs-server](https://hub.docker.com/r/fsouza/fake-gcs-server)
 
 ## Examples
 
@@ -36,3 +39,16 @@ Datastore mode | DatastoreEmulatorContainer | [gcr.io/google.com/cloudsdktool/g
 <!--codeinclude-->
 [Starting a Datastore Emulator container with a custom emulator image](../../packages/modules/gcloud/src/datastore-emulator-container.test.ts) inside_block:datastore5
 <!--/codeinclude-->
+
+### Cloud PubSub mode
+
+<!--codeinclude-->
+[Starting a Cloud PubSub Emulator container with the default image](../../packages/modules/gcloud/src/pubsub-emulator-container.test.ts) inside_block:pubsub6
+<!--/codeinclude-->
+
+### Cloud Storage mode
+
+The Cloud Storage mode doesn't rely on a built-in emulator created by Google but instead depends on a fake Cloud Storage server implemented by [Francisco Souza](https://github.com/fsouza). The project is open-source, and the repository can be found at [fsouza/fake-gcs-server](https://github.com/fsouza/fake-gcs-server).
+<!--codeinclude-->
+[Starting a Cloud Storage Emulator container with the default image](../../packages/modules/gcloud/src/cloudstorage-emulator-container.test.ts) inside_block:cloudstorage7
+<!--/codeinclude-->