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]

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?

[bshaffer]

I've made the necessary changes in 2248b46, so these tests are now passing.

In the future, please submit pull requests from feature branches, rather than from main. For instance, you could create a branch named storage-transfer-samples and submit the PR to main from there.

Thank you!