Move tables with atomic transactions

[GuptaManan100]

Description

This PR adds the test to verify MoveTables works with atomic transactions without any issues.

This PR also adds a design doc detailing how everything is supposed to work.

Related Issue(s)

• RFC: Atomic Distributed Transactions #16245

Checklist

• "Backport to:" labels have been added if this change should be back-ported to release branches
• If this change is to be back-ported to previous releases, a justification is included in the PR description
• Tests were added or are not required
• Did the new or modified tests pass consistently locally and on CI?
• Documentation was added or is not required

Deployment Notes

[vitess-bot]

Review Checklist

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General

• Ensure that the Pull Request has a descriptive title.
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Tests

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Documentation

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Backward compatibility

• Protobuf changes should be wire-compatible.
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• vtctl command output order should be stable and awk-able.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.95%. Comparing base (d916e81) to head (5880d76).
Report is 14 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16676      +/-   ##
==========================================
+ Coverage   68.91%   68.95%   +0.03%     
==========================================
  Files        1564     1565       +1     
  Lines      201337   201556     +219     
==========================================
+ Hits       138759   138974     +215     
- Misses      62578    62582       +4     

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