feat: introduce AppsChat

[bshaffer]

b/326631249

Note: The AppsChat package also contains the protos from google/apps/card. This is because:

• at the moment, there are no other packages which depend on google/apps/card.
• If there is a time in the future where we deploy another package which relies on google/apps/card, we can create a new package (google/apps-shared-protos) to contain the protos in google/apps/card, and any others which exist at the time.

IF there are other use cases which I am not aware of, where a customer would want to use the protos in google/apps/card without using the AppsChat package, that would be another good reason to split them out now. I'm happy to do so if that's the case, but I wanted to keep this simple for now if we don't have a use-case for doing so.

[snippet-bot]

Here is the summary of changes.

You are about to add 22 region tags.

• AppsChat/samples/V1/ChatServiceClient/complete_import_space.php:25, tag chat_v1_generated_ChatService_CompleteImportSpace_sync
• AppsChat/samples/V1/ChatServiceClient/create_membership.php:25, tag chat_v1_generated_ChatService_CreateMembership_sync
• AppsChat/samples/V1/ChatServiceClient/create_message.php:25, tag chat_v1_generated_ChatService_CreateMessage_sync
• AppsChat/samples/V1/ChatServiceClient/create_reaction.php:25, tag chat_v1_generated_ChatService_CreateReaction_sync
• AppsChat/samples/V1/ChatServiceClient/create_space.php:25, tag chat_v1_generated_ChatService_CreateSpace_sync
• AppsChat/samples/V1/ChatServiceClient/delete_membership.php:25, tag chat_v1_generated_ChatService_DeleteMembership_sync
• AppsChat/samples/V1/ChatServiceClient/delete_message.php:25, tag chat_v1_generated_ChatService_DeleteMessage_sync
• AppsChat/samples/V1/ChatServiceClient/delete_reaction.php:25, tag chat_v1_generated_ChatService_DeleteReaction_sync
• AppsChat/samples/V1/ChatServiceClient/delete_space.php:25, tag chat_v1_generated_ChatService_DeleteSpace_sync
• AppsChat/samples/V1/ChatServiceClient/find_direct_message.php:25, tag chat_v1_generated_ChatService_FindDirectMessage_sync
• AppsChat/samples/V1/ChatServiceClient/get_attachment.php:25, tag chat_v1_generated_ChatService_GetAttachment_sync
• AppsChat/samples/V1/ChatServiceClient/get_membership.php:25, tag chat_v1_generated_ChatService_GetMembership_sync
• AppsChat/samples/V1/ChatServiceClient/get_message.php:25, tag chat_v1_generated_ChatService_GetMessage_sync
• AppsChat/samples/V1/ChatServiceClient/get_space.php:25, tag chat_v1_generated_ChatService_GetSpace_sync
• AppsChat/samples/V1/ChatServiceClient/list_memberships.php:25, tag chat_v1_generated_ChatService_ListMemberships_sync
• AppsChat/samples/V1/ChatServiceClient/list_messages.php:25, tag chat_v1_generated_ChatService_ListMessages_sync
• AppsChat/samples/V1/ChatServiceClient/list_reactions.php:25, tag chat_v1_generated_ChatService_ListReactions_sync
• AppsChat/samples/V1/ChatServiceClient/list_spaces.php:25, tag chat_v1_generated_ChatService_ListSpaces_sync
• AppsChat/samples/V1/ChatServiceClient/set_up_space.php:25, tag chat_v1_generated_ChatService_SetUpSpace_sync
• AppsChat/samples/V1/ChatServiceClient/update_message.php:25, tag chat_v1_generated_ChatService_UpdateMessage_sync
• AppsChat/samples/V1/ChatServiceClient/update_space.php:25, tag chat_v1_generated_ChatService_UpdateSpace_sync
• AppsChat/samples/V1/ChatServiceClient/upload_attachment.php:25, tag chat_v1_generated_ChatService_UploadAttachment_sync

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[vishwarajanand]

Approving to unblock. It seems logical to have both Google\Apps\Chat\* and Google\Apps\Card\* for now under AppsChat/src folder.

I checked the namespaces they seem correctly defined in composer.json files.