docs: add proposal of enhancing karmadactl

[hulizhe]

What type of PR is this?
/kind feature

What this PR does / why we need it:
Enhance karmadactl operation and maintenance experience

Which issue(s) this PR fixes:
Parts of #5248

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.02%. Comparing base (5e3e5ad) to head (dcc0ad0).
Report is 131 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5245      +/-   ##
==========================================
+ Coverage   28.25%   29.02%   +0.76%     
==========================================
  Files         632      632              
  Lines       43739    43862     +123     
==========================================
+ Hits        12360    12729     +369     
+ Misses      30478    30218     -260     
- Partials      901      915      +14     

Flag	Coverage Δ
unittests	29.02% <ø> (+0.76%)	⬆️

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[zhzhuang-zju]

/retest

[XiShanYongYe-Chang]

/assign
/assign @chaunceyjiang
/retest

[chaunceyjiang]

/assign

[hulizhe]

kindly ping @XiShanYongYe-Chang @chaunceyjiang @RainbowMango @zhzhuang-zju

[RainbowMango]

/lgtm
/approve

Generally looks good to me.
But we are open to make changes during the implementation, such as minor flags updates.

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango

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[zhzhuang-zju]

/retest