chore(generic): add kube-aggregator client

[zzzzhhb]

What type of PR is this?

Enhancements

What this PR does / why we need it:

add kube-aggregator client

Which issue(s) this PR fixes:

Special notes for your reviewer:

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (1ccf532) 53.51% compared to head (49b4716) 53.30%.

❗ Current head 49b4716 differs from pull request most recent head 775e5b9. Consider uploading reports for the commit 775e5b9 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #337      +/-   ##
==========================================
- Coverage   53.51%   53.30%   -0.21%     
==========================================
  Files         431      431              
  Lines       47356    47368      +12     
==========================================
- Hits        25341    25250      -91     
- Misses      19167    19268     +101     
- Partials     2848     2850       +2     

Flag	Coverage Δ
unittest	53.30% <63.33%> (-0.21%)	⬇️

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

Files	Coverage Δ
cmd/base/context.go	64.23% <100.00%> (+0.97%)	⬆️
cmd/base/context_fake.go	74.32% <100.00%> (+2.60%)	⬆️
pkg/client/genericclient.go	0.00% <0.00%> (ø)

... and 15 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.