add new command karmadactl attach

[hulizhe]

What type of PR is this?
/kind feature

What this PR does / why we need it:
add new command karmadactl attach
Which issue(s) this PR fixes:
Parts of #5249

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 44 lines in your changes missing coverage. Please review.

Project coverage is 30.93%. Comparing base (cc12739) to head (55c8f90).

Files	Patch %	Lines
pkg/karmadactl/attach/attach.go	0.00%	43 Missing ⚠️
pkg/karmadactl/karmadactl.go	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5395      +/-   ##
==========================================
- Coverage   30.96%   30.93%   -0.04%     
==========================================
  Files         634      635       +1     
  Lines       44139    44183      +44     
==========================================
- Hits        13669    13667       -2     
- Misses      29481    29526      +45     
- Partials      989      990       +1     

Flag	Coverage Δ
unittests	30.93% <0.00%> (-0.04%)	⬇️

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[RainbowMango]

/assign

[zhzhuang-zju]

/lgtm

[RainbowMango]

/lgtm
/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango

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