feat: add proposals for adding rollouts support for LeaderWorkerSet

[kirat10x]

Ⅰ. Describe what this PR does

Ⅱ. Does this pull request fix one issue?

Ⅲ. Special notes for reviews

@furykerry @zmberg @FillZpp Please review, Thanks !

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51.38%. Comparing base (8416512) to head (42d3c15).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #324   +/-   ##
=======================================
  Coverage   51.38%   51.38%           
=======================================
  Files          66       66           
  Lines        8559     8559           
=======================================
  Hits         4398     4398           
  Misses       3575     3575           
  Partials      586      586           

Flag	Coverage Δ
unittests	51.38% <ø> (ø)

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