Feat: add apply

[Somefive]

Fixes #10

[codecov]

Codecov Report

Patch coverage: 85.81% and project coverage change: +0.08 🎉

Comparison is base (2cef0c3) 87.78% compared to head (58c32e2) 87.86%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #89      +/-   ##
==========================================
+ Coverage   87.78%   87.86%   +0.08%     
==========================================
  Files          81       85       +4     
  Lines        3871     4005     +134     
==========================================
+ Hits         3398     3519     +121     
- Misses        359      367       +8     
- Partials      114      119       +5     

Flag	Coverage Δ
unit-test	87.86% <85.81%> (+0.08%)	⬆️

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

Impacted Files	Coverage Δ
util/k8s/patch/patch.go	82.05% <57.14%> (-3.87%)	⬇️
util/k8s/apply/apply.go	84.09% <84.09%> (ø)
util/builder/option.go	100.00% <100.00%> (ø)
util/jsonutil/setter.go	100.00% <100.00%> (ø)
util/k8s/apply/types.go	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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