feat: Samples for start/stop Disk Asynchronous Replication

[Thoughtseize1]

Description

Created 2 Samples for Start/Stop Disk Asynchronous Replication doc.page.

Region tag	Filename
compute_disk_start_replication	replication_disk_start.py
compute_disk_stop_replication	replication_disk_stop.py

Checklist

• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• README is updated to include all relevant information
• Tests pass: nox -s py-3.9 (see Test Environment Setup)
• Lint pass: nox -s lint (see Test Environment Setup)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

You are about to add 2 region tags.

• compute/client_library/snippets/disks/replication_disk_start.py:22, tag compute_disk_start_replication
• compute/client_library/snippets/disks/replication_disk_stop.py:22, tag compute_disk_stop_replication

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