Add benchmark tests for configurator

[jjngx]

Proposed changes

This PR adds initial benchmark tests for NIC configurator.

➜  kubernetes-ingress git:(test/configurator-benchmarks) ✗ 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
BenchmarkAddOrUpdateIngress-10                 	   26958	     44135 ns/op	   18716 B/op	     321 allocs/op
BenchmarkAddOrUpdateMergeableIngress-10        	   22483	     53538 ns/op	   26157 B/op	     388 allocs/op
BenchmarkUpdateEndpointsMergeableIngress-10    	   22503	     53233 ns/op	   26157 B/op	     388 allocs/op
BenchmarkAddVirtualServerMetricsLabels-10      	  700798	      1665 ns/op	    1681 B/op	      25 allocs/op
BenchmarkAddTransportServerMetricsLabels-10    	  775048	      1530 ns/op	    1697 B/op	      25 allocs/op
PASS
ok  	github.com/nginxinc/kubernetes-ingress/internal/configs	8.394s

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 (860a514).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6423      +/-   ##
==========================================
+ 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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