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
• [ ] Add transfer between posix
• [ ] Add download to posix
• [ ] Add Event driven GCS

[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](https://github.com/thiyaguk09/php-docs-samples-fork/blob/232bfa317b6d5de7a2de3c8b753c67a3a67b9333/storagetransfer/src/check_latest_transfer_operation.php#L20), tag `storagetransfer_get_latest_transfer_operation` - [storagetransfer/src/event_driven_gcs_transfer.php:21](https://github.com/thiyaguk09/php-docs-samples-fork/blob/232bfa317b6d5de7a2de3c8b753c67a3a67b9333/storagetransfer/src/event_driven_gcs_transfer.php#L21), tag `storagetransfer_create_event_driven_gcs_transfer` - [storagetransfer/src/manifest_request.php:20](https://github.com/thiyaguk09/php-docs-samples-fork/blob/232bfa317b6d5de7a2de3c8b753c67a3a67b9333/storagetransfer/src/manifest_request.php#L20), tag `storagetransfer_manifest_request` - [storagetransfer/src/nearline_request.php:20](https://github.com/thiyaguk09/php-docs-samples-fork/blob/232bfa317b6d5de7a2de3c8b753c67a3a67b9333/storagetransfer/src/nearline_request.php#L20), tag `storagetransfer_transfer_to_nearline` - [storagetransfer/src/posix_download.php:21](https://github.com/thiyaguk09/php-docs-samples-fork/blob/232bfa317b6d5de7a2de3c8b753c67a3a67b9333/storagetransfer/src/posix_download.php#L21), tag `storagetransfer_download_to_posix` - [storagetransfer/src/posix_request.php:20](https://github.com/thiyaguk09/php-docs-samples-fork/blob/232bfa317b6d5de7a2de3c8b753c67a3a67b9333/storagetransfer/src/posix_request.php#L20), tag `storagetransfer_transfer_from_posix` - [storagetransfer/src/posix_to_posix_request.php:20](https://github.com/thiyaguk09/php-docs-samples-fork/blob/232bfa317b6d5de7a2de3c8b753c67a3a67b9333/storagetransfer/src/posix_to_posix_request.php#L20), 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?