feat(sheet): export vars for sort plugin

[yuhongz]

close #xxx

Pull Request Checklist

• Related tickets or issues have been linked in the PR description (or missing issue).
• Naming convention is followed (do please check it especially when you created new plugins, commands and resources).
• Unit tests have been added for the changes (if applicable).
• Breaking changes have been documented (or no breaking changes introduced in this PR).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 26.92%. Comparing base (e5020d7) to head (3d03722).
Report is 3 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #2587      +/-   ##
==========================================
- Coverage   27.36%   26.92%   -0.44%     
==========================================
  Files        1709     1714       +5     
  Lines       86068    87513    +1445     
  Branches    17986    18331     +345     
==========================================
+ Hits        23551    23564      +13     
- Misses      62517    63949    +1432     

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[github-actions]

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[wzhudev]

LGTM. We are good to go once the CI problem is fixed.

[wzhudev]

LGTM. We are good to go once the CI problem is fixed.