Add migration script to remove version vector

[chacha912]

What this PR does / why we need it:

• Add new migration script for removing version vector
• Clean up obsolete version vector data structure

Which issue(s) this PR fixes:

Related #1088

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

for test

Additional documentation:

Checklist:

• Added relevant tests or not required
• Addressed and resolved all CodeRabbit review comments
• Didn't break anything

[coderabbitai]

Note

Currently processing new changes in this PR. This may take a few minutes, please wait...

📥 Commits

Reviewing files that changed from the base of the PR and between 1084b8d and c14c213.

📒 Files selected for processing (3)

• cmd/yorkie/migration.go (2 hunks)
• migrations/v0.5.7/main.go (1 hunks)
• migrations/v0.5.7/remove-version-vector.go (1 hunks)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.89%. Comparing base (1084b8d) to head (c14c213).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1091   +/-   ##
=======================================
  Coverage   46.89%   46.89%           
=======================================
  Files          84       84           
  Lines       12243    12243           
=======================================
  Hits         5741     5741           
  Misses       5926     5926           
  Partials      576      576           

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[hackerwins]

Thanks for your contribution.