feat: Add status metric to config

[abhipatnala]

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, using fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when the PR gets merged):
Fixes #2918

Special notes for your reviewer:

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 76.92308% with 9 lines in your changes missing coverage. Please review.

Project coverage is 47.82%. Comparing base (3350319) to head (1ce8461).
Report is 162 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/controller/config/config_controller.go	53.84%	4 Missing and 2 partials ⚠️
pkg/controller/config/stats_reporter.go	88.46%	2 Missing and 1 partial ⚠️

❗ There is a different number of reports uploaded between BASE (3350319) and HEAD (1ce8461). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (3350319)	HEAD (1ce8461)
unittests	2	1

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3656      +/-   ##
==========================================
- Coverage   54.49%   47.82%   -6.68%     
==========================================
  Files         134      222      +88     
  Lines       12329    18738    +6409     
==========================================
+ Hits         6719     8961    +2242     
- Misses       5116     8936    +3820     
- Partials      494      841     +347     

Flag	Coverage Δ
unittests	47.82% <76.92%> (-6.68%)	⬇️

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[maxsmythe]

What are the observability goals for this metric? As in: what kinds of conclusions should consumers be able to draw by observing this metric? Is the data we are expressing sufficient to support those goals?

What are the gaps in reporting present in this current code?

[JaydipGabani]

If GK admin and consumer of metrics are two different users, then I think having number of kinds getting synced in config resource might be helpful when access to config resource is resticted?

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed in 14 days if no further activity occurs. Thank you for your contributions.