Feat/transport server external name

[jjngx]

Proposed changes

Initial support for Transport Server external name including examples.

Checklist

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

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

[codecov-commenter]

Codecov Report

Merging #3041 (0186b91) into main (23be85f) will decrease coverage by 0.02%. The diff coverage is 23.80%.

@@            Coverage Diff             @@
##             main    #3041      +/-   ##
==========================================
- Coverage   52.31%   52.28%   -0.03%     
==========================================
  Files          58       58              
  Lines       15995    16028      +33     
==========================================
+ Hits         8368     8381      +13     
- Misses       7350     7369      +19     
- Partials      277      278       +1     

Impacted Files	Coverage Δ
cmd/nginx-ingress/flags.go	34.42% <ø> (ø)
cmd/nginx-ingress/main.go	0.00% <0.00%> (ø)
internal/configs/config_params.go	76.74% <ø> (ø)
internal/configs/configurator.go	37.06% <0.00%> (-0.32%)	:arrow_down:
internal/configs/version1/config.go	0.00% <ø> (ø)
internal/configs/version2/http.go	0.00% <ø> (ø)
internal/k8s/controller.go	11.07% <0.00%> (-0.05%)	:arrow_down:
internal/configs/configmaps.go	20.37% <100.00%> (+0.16%)	:arrow_up:
internal/configs/transportserver.go	97.48% <100.00%> (+3.70%)	:arrow_up:
internal/configs/virtualserver.go	95.22% <100.00%> (+<0.01%)	:arrow_up:
... and 4 more

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[jjngx]

Can we add a README for the new externalname-services example files?

It's WIP (work in progress)