Add custom listener controls to VirtualServer

[shaun-nx]

Proposed changes

Related issue: #4094
Related discussion: #3724

This change updates both VirtualServer and GlobalConfiguration resources to enable VirtualServers to specify custom HTTP and HTTPS listener ports.

Example VirtualServer YAML:

apiVersion: k8s.nginx.org/v1
kind: VirtualServer
metadata:
  name: cafe
spec:
  listener:
    http: http-8083
    https: https-8443
  host: cafe.example.com
  tls:
    secret: cafe-secret
  upstreams:
  ...

Example GlobalConfiguration YAML:

apiVersion: k8s.nginx.org/v1alpha1
kind: GlobalConfiguration
metadata:
  name: nginx-configuration
  namespace: nginx-ingress
spec:
  listeners:
  - name: http-8083
    port: 8083
    protocol: HTTP
  - name: https-8443
    port: 8443
    protocol: HTTP
    ssl: true

When performing requests to the example VirtualServer, all HTTP based requests will use port 8083 and HTTPS based requests will use 8443.

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

Merging #4271 (772d3c6) into main (79a3eb9) will increase coverage by 0.19%.
The diff coverage is 70.00%.

@@            Coverage Diff             @@
##             main    #4271      +/-   ##
==========================================
+ Coverage   51.97%   52.17%   +0.19%     
==========================================
  Files          59       59              
  Lines       16762    16930     +168     
==========================================
+ Hits         8712     8833     +121     
- Misses       7753     7798      +45     
- Partials      297      299       +2     

Files Changed	Coverage Δ
internal/configs/configurator.go	37.94% <0.00%> (-0.54%)	⬇️
internal/configs/version2/http.go	0.00% <ø> (ø)
internal/k8s/controller.go	12.00% <0.00%> (-0.11%)	⬇️
...g/apis/configuration/validation/transportserver.go	96.21% <ø> (-0.10%)	⬇️
internal/configs/virtualserver.go	94.57% <100.00%> (+0.02%)	⬆️
internal/k8s/configuration.go	95.76% <100.00%> (-0.04%)	⬇️
...is/configuration/validation/globalconfiguration.go	92.39% <100.00%> (+5.11%)	⬆️

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[jjngx]

👍🏻 great stuff!