feat(storage transfer): Added samples for storage transfer

[thiyaguk09]

• [ ] Add quickstart samples for sts
• [ ] Add nearline samples for sts
• [ ] Add posix and manifest samples for sts
• [ ] Add check latest transfer operation samples for sts
• [ ] Add transfer from posix samples for sts

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 7 region tags.

• storagetransfer/src/check_latest_transfer_operation.php:20, tag storagetransfer_get_latest_transfer_operation
• storagetransfer/src/event_driven_gcs_transfer.php:21, tag storagetransfer_create_event_driven_gcs_transfer
• storagetransfer/src/manifest_request.php:20, tag storagetransfer_manifest_request
• storagetransfer/src/nearline_request.php:20, tag storagetransfer_transfer_to_nearline
• storagetransfer/src/posix_download.php:21, tag storagetransfer_download_to_posix
• storagetransfer/src/posix_request.php:20, tag storagetransfer_transfer_from_posix
• storagetransfer/src/posix_to_posix_request.php:20, tag storagetransfer_transfer_posix_to_posix

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[danielduhh]

@bshaffer looks like bigtable is causing static analysis to fail. Any thoughts on mitigation?