[WIP]Add gen-docs scripts

[Poor12]

Signed-off-by: Poor12 [email protected]

What type of PR is this? /kind feature

What this PR does / why we need it: This pr import gen-docs script to automatically generate documentation for karmadactl and karmada components based on cobra refer to https://github.com/kubernetes/kubernetes/tree/master/cmd/gendocs.

Our current cli tools are still in a rapid development stage, and these generated docs are not intended to be our user-facing documentation directly, but only for reference.

Which issue(s) this PR fixes: Fixes #

Special notes for your reviewer:

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

[codecov-commenter]

Codecov Report

Merging #2561 (6d5d8e8) into master (93817a9) will decrease coverage by 0.00%. The diff coverage is 26.95%.

@@            Coverage Diff             @@
##           master    #2561      +/-   ##
==========================================
- Coverage   25.61%   25.61%   -0.01%     
==========================================
  Files         184      187       +3     
  Lines       18513    18628     +115     
==========================================
+ Hits         4742     4771      +29     
- Misses      13425    13509      +84     
- Partials      346      348       +2     

Flag	Coverage Δ
unittests	25.61% <26.95%> (-0.01%)	:arrow_down:

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

Impacted Files	Coverage Δ
cmd/gencomponentdocs/gen_component_docs.go	0.00% <0.00%> (ø)
pkg/karmadactl/apply.go	0.00% <ø> (ø)
pkg/karmadactl/cordon.go	0.00% <ø> (ø)
pkg/karmadactl/deinit.go	0.00% <ø> (ø)
pkg/karmadactl/describe.go	0.00% <ø> (ø)
pkg/karmadactl/exec.go	0.00% <ø> (ø)
pkg/karmadactl/get.go	0.00% <ø> (ø)
pkg/karmadactl/join.go	0.00% <ø> (ø)
pkg/karmadactl/logs.go	0.00% <ø> (ø)
pkg/karmadactl/promote.go	0.00% <ø> (ø)
... and 8 more

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[Poor12]

/cc @RainbowMango @lonelyCZ You can see the effect by https://deploy-preview-206--karmada.netlify.app/docs/next/reference/karmadactl/karmadactl-commands/karmadactl_index. BTW, index page is generated by the long description of the command. Content of some commands still need to improve.

[RainbowMango]

/assign

[karmada-bot]

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