feat: add ReclaimPolicy for GameServer

[chrisliu1995]

#103

#110

[codecov-commenter]

Codecov Report

Attention: 50 lines in your changes are missing coverage. Please review.

Comparison is base (250bd86) 32.63% compared to head (c2aae1a) 35.47%.
Report is 4 commits behind head on master.

Files	Patch %	Lines
...kg/controllers/gameserver/gameserver_controller.go	0.00%	25 Missing ⚠️
...controllers/gameserverset/gameserverset_manager.go	63.93%	17 Missing and 5 partials ⚠️
pkg/util/gameserver.go	94.11%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #115      +/-   ##
==========================================
+ Coverage   32.63%   35.47%   +2.83%     
==========================================
  Files          23       26       +3     
  Lines        3144     3538     +394     
==========================================
+ Hits         1026     1255     +229     
- Misses       2065     2217     +152     
- Partials       53       66      +13     

Flag	Coverage Δ
unittests	35.47% <63.50%> (+2.83%)	⬆️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[ringtail]

/LGTM

[kruise-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: ringtail
Once this PR has been reviewed and has the lgtm label, please assign zmberg for approval by writing /assign @zmberg in a comment. For more information see:The Kubernetes Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment