feat: support cache resources configurable #7

[yusank]

What type of PR is this?

/kind feature

What this PR does / why we need it:

To improve performance of webhook and use less memory.

Which issue(s) this PR fixes:

Fixes #7

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

Add one new args pre-cache-resources to configure which resources to cache, for example:

... // other arguments 
--pre-cache-resources=Deployment/apps/v1,Replicas/apps/v1

[codecov[bot]]

Codecov Report

Merging #13 (9bede4e) into main (52d511e) will increase coverage by 24.51%. The diff coverage is 91.66%.

@@             Coverage Diff             @@
##             main      #13       +/-   ##
===========================================
+ Coverage   35.48%   60.00%   +24.51%     
===========================================
  Files           2        2               
  Lines          31       55       +24     
===========================================
+ Hits           11       33       +22     
- Misses         20       22        +2     

Impacted Files	Coverage Δ
cmd/app/options/options.go	50.00% <91.66%> (+50.00%)	:arrow_up:

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