samples(storage_transfer): Add samples for storage transfer services

[shubhangi-google]

Adding samples and acceptance tests for following storage transfer services:

• Storagetransfer_manifest_request
• storagetransfer_create_event_driven_gcs_transfer
• Storagetransfer_transfer_from_posix
• Storagetransfer_quickstart
• Storagetransfer_transfer_to_nearline

[snippet-bot]

Here is the summary of changes.

You are about to add 4 region tags.

• google-cloud-storage_transfer/samples/event_driven_gcs_transfer.rb:15, tag storagetransfer_create_event_driven_gcs_transfer
• google-cloud-storage_transfer/samples/manifest_request.rb:15, tag storagetransfer_manifest_request
• google-cloud-storage_transfer/samples/nearline_request.rb:15, tag storagetransfer_transfer_to_nearline
• google-cloud-storage_transfer/samples/transfer_from_posix_request.rb:15, tag storagetransfer_transfer_from_posix

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