feat: support auto scaling-up based on minAvailable

[chrisliu1995]

No description provided.

[sonatype-lift]

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[kruise-bot]

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[codecov-commenter]

Codecov Report

Merging #88 (460e4a8) into master (c4e4197) will decrease coverage by 0.38%.
Report is 9 commits behind head on master.
The diff coverage is 13.88%.

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@@            Coverage Diff             @@
##           master      #88      +/-   ##
==========================================
- Coverage   30.06%   29.68%   -0.38%     
==========================================
  Files          18       19       +1     
  Lines        2365     2503     +138     
==========================================
+ Hits          711      743      +32     
- Misses       1609     1715     +106     
  Partials       45       45              

Flag	Coverage Δ
unittests	29.68% <13.88%> (-0.38%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
...kg/controllers/gameserver/gameserver_controller.go	0.00% <0.00%> (ø)
pkg/controllers/gameserver/gameserver_manager.go	36.63% <0.00%> (-2.90%)	⬇️
pkg/util/gameserver.go	38.02% <100.00%> (+6.17%)	⬆️

... and 4 files with indirect coverage changes

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[ringtail]

/LGTM