Add support for gRPC

[diptadas]

• Initial test
• Complete docs
• e2e tests
• merge Update haproxy version to 1.9.2 #1312
• merge Support mounting any configmap/secret into HAProxy pod #1330
• merge Fix test-server certs #1331

[codecov-io]

Codecov Report

Merging #1328 into master will increase coverage by 0.04%.
The diff coverage is 17.42%.

@@            Coverage Diff            @@
##           master   #1328      +/-   ##
=========================================
+ Coverage    3.71%   3.75%   +0.04%     
=========================================
  Files          35      35              
  Lines       18448   18568     +120     
=========================================
+ Hits          685     698      +13     
- Misses      17639   17743     +104     
- Partials      124     127       +3

Impacted Files	Coverage Δ
pkg/haproxy/api/types.go	11.11% <ø> (ø)	⬆️
apis/voyager/v1beta1/zz_generated.deepcopy.go	0% <0%> (ø)	⬆️
apis/voyager/v1beta1/openapi_generated.go	0% <0%> (ø)	⬆️
pkg/ingress/parser.go	3.52% <0%> (-0.06%)	⬇️
apis/voyager/v1beta1/annotations.go	29.79% <0%> (-0.31%)	⬇️
apis/voyager/v1beta1/diff.go	23.33% <37.25%> (-0.34%)	⬇️
apis/voyager/v1beta1/validator.go	54.54% <66.66%> (+0.24%)	⬆️

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