feat: implement offline kubernetes controller

[shawnh2]

What type of PR is this?

What this PR does / why we need it:

impl offline controller detailed in #3213 (comment) and let file-provider to be able to utilise offline controller.

Which issue(s) this PR fixes:

fix #3213

Release Notes: Yes

[codecov]

Codecov Report

Attention: Patch coverage is 44.37086% with 84 lines in your changes missing coverage. Please review.

Project coverage is 65.16%. Comparing base (096cb8d) to head (85f110d).
Report is 18 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/provider/kubernetes/controller_offline.go	0.00%	79 Missing ⚠️
internal/provider/kubernetes/indexers.go	93.05%	0 Missing and 5 partials ⚠️

❌ Your patch check has failed because the patch coverage (44.37%) is below the target coverage (60.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5767      +/-   ##
==========================================
- Coverage   65.19%   65.16%   -0.04%     
==========================================
  Files         214      216       +2     
  Lines       34321    34654     +333     
==========================================
+ Hits        22377    22581     +204     
- Misses      10591    10691     +100     
- Partials     1353     1382      +29     

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[zhaohuabing]

Hi @shawnh2 this PR adds the "offline controller," but it doesn’t include an example of how to actually use it. Since it's just a small change, could we also include the file provider modification as part of this PR to verify it works?

Thanks!

[shawnh2]

Hi @shawnh2 this PR adds the "offline controller," but it doesn’t include an example of how to actually use it. Since it's just a small change, could we also include the file provider modification as part of this PR to verify it works?

Thanks!

sure, I was intend to include file provider in next PR. I will add it then.