[WIP]feat(kcmas):mock collector

[zzzzhhb]

What type of PR is this?

Enhancements

What this PR does / why we need it:

kcmas supports generating mock data for pressure test.

Which issue(s) this PR fixes:

Special notes for your reviewer:

[codecov]

Codecov Report

Attention: 173 lines in your changes are missing coverage. Please review.

Comparison is base (1ccf532) 53.51% compared to head (066145c) 53.37%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #335      +/-   ##
==========================================
- Coverage   53.51%   53.37%   -0.14%     
==========================================
  Files         431      434       +3     
  Lines       47356    47551     +195     
==========================================
+ Hits        25341    25382      +41     
- Misses      19167    19320     +153     
- Partials     2848     2849       +1     

Flag	Coverage Δ
unittest	53.37% <11.28%> (-0.14%)	⬇️

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Files	Coverage Δ
pkg/custom-metric/mock/utils.go	100.00% <100.00%> (ø)
pkg/custom-metric/mock/mock_store.go	0.00% <0.00%> (ø)
pkg/custom-metric/mock/mock_collector.go	0.00% <0.00%> (ø)

... and 16 files with indirect coverage changes

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