Add initial benchmark tests for NIC

[jjngx]

Proposed changes

This PR adds benchmark tests for NIC - annotations.

➜  kubernetes-ingress git:(test/bench) ✗ go test -benchmem -run=^$  -bench . github.com/nginxinc/kubernetes-ingress/internal/configs
goos: darwin
goarch: arm64
pkg: github.com/nginxinc/kubernetes-ingress/internal/configs
cpu: Apple M1 Pro
BenchmarkParseRewrites-10                                    	 4749325	       251.5 ns/op	      96 B/op	       3 allocs/op
BenchmarkParseRewritesWithLeadingAndTrailingWhitespace-10    	 4718683	       256.7 ns/op	      96 B/op	       3 allocs/op
BenchmarkParseStickyService-10                               	  985568	      1168 ns/op	      64 B/op	       2 allocs/op
BenchmarkFilterMasterAnnotations-10                          	16147633	        74.11 ns/op	       0 B/op	       0 allocs/op
BenchmarkFilterMinionAnnotations-10                          	22283346	        52.99 ns/op	       0 B/op	       0 allocs/op
BenchmarkMergeMasterAnnotationsIntoMinion-10                 	 9383858	       128.1 ns/op	       0 B/op	       0 allocs/op
PASS
ok  	github.com/nginxinc/kubernetes-ingress/internal/configs	8.390s

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.24%. Comparing base (166b954) to head (8f486f6).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6422      +/-   ##
==========================================
+ Coverage   53.20%   53.24%   +0.03%     
==========================================
  Files          85       85              
  Lines       16002    16015      +13     
==========================================
+ Hits         8514     8527      +13     
- Misses       7081     7082       +1     
+ Partials      407      406       -1     

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