[WIP] karmada operator support external etcd, part1

[liangyuanpeng]

What type of PR is this?
/kind feature

What this PR does / why we need it:

Part1 of #3860

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

karmada operator support external etcd

[karmada-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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Needs approval from an approver in each of these files:

• charts/OWNERS
• operator/OWNERS
• operator/pkg/apis/OWNERS

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[codecov-commenter]

Codecov Report

Merging #3902 (eadf0f6) into master (e5277b6) will decrease coverage by 0.01%.
Report is 2 commits behind head on master.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##           master    #3902      +/-   ##
==========================================
- Coverage   54.83%   54.82%   -0.01%     
==========================================
  Files         228      228              
  Lines       21848    21848              
==========================================
- Hits        11981    11979       -2     
- Misses       9227     9229       +2     
  Partials      640      640              

Flag	Coverage Δ
unittests	54.82% <ø> (-0.01%)	⬇️

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

see 1 file with indirect coverage changes

[liangyuanpeng]

I want to push it after operator have some e2e test and i have create a PR to create e2e test for operator, so this PR is pending for #4148