add Support orphan deletion proposal

[Poor12]

What type of PR is this?
/kind design

What this PR does / why we need it:
Add Support orphan deletion proposal.
The requirement of this proposal comes from #3004, discussions on the wechat group and some inconveniences of users in use. I'd like to invite more people to discuss about it.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:
None

[karmada-bot]

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[codecov-commenter]

Codecov Report

Merging #3328 (ecd7f66) into master (a902d8a) will increase coverage by 2.16%.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##           master    #3328      +/-   ##
==========================================
+ Coverage   49.13%   51.29%   +2.16%     
==========================================
  Files         209      209              
  Lines       18754    18757       +3     
==========================================
+ Hits         9214     9621     +407     
+ Misses       9039     8637     -402     
+ Partials      501      499       -2     

Flag	Coverage Δ
unittests	51.29% <ø> (+2.16%)	⬆️

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see 5 files with indirect coverage changes

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[Ranler]

+1

[RainbowMango]

/close
In favor of #5577.

[karmada-bot]

@RainbowMango: Closed this PR.

In response to this:

/close
In favor of #5577.

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