refactor lbc to add metadata struct

[j1m-ryan]

Proposed changes

Add metadata struct to lbc, for the NIC pod and namespace. In the future this can be extended to add other metadata related to NIC.

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

Attention: Patch coverage is 16.66667% with 5 lines in your changes missing coverage. Please review.

Project coverage is 53.15%. Comparing base (0bbf069) to head (5a2610b).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/k8s/controller.go	33.33%	2 Missing ⚠️
cmd/nginx-ingress/main.go	0.00%	1 Missing ⚠️
internal/k8s/ingress_link.go	0.00%	1 Missing ⚠️
internal/k8s/leader.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6885      +/-   ##
==========================================
- Coverage   53.16%   53.15%   -0.01%     
==========================================
  Files          88       88              
  Lines       20394    20396       +2     
==========================================
  Hits        10842    10842              
- Misses       9109     9111       +2     
  Partials      443      443              

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