feat(gateway): configure DNS records for Gateway API resources

[wenyingd]

1. Add Gateway reconciler, route DNS sub-reconcilers, GC, and Gateway API scheme registration.
2. Support using annotation to claim DNS record for a K8s Gateway resource
3. Support configuring DNS record for the HTTPRoute/GRPCRoute/TLSRoute by identifying the FQDN from spec.hostnames and from annotation
4. Align the DNS record configuration with external-dns behaviors
5. Introduce gatewayIPCache to maintain the supported Gateway and its listeners
6. DNS records for xxRoute are configured only when 1) the route is accepted by a parent Gateway which is supported, and 2) the claimed hostname is validated by both the parent listeners and any of the allowed DNS zones in the Namespace.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 76.99639% with 700 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.02%. Comparing base (6ae0434) to head (441a69a).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/controllers/gateway/route_subreconciler.go	73.17%	53 Missing and 28 partials ⚠️
pkg/controllers/gateway/gateway_controller.go	75.30%	64 Missing and 16 partials ⚠️
pkg/controllers/gateway/handlers.go	76.26%	41 Missing and 20 partials ⚠️
pkg/controllers/service/service_lb_dns.go	65.62%	39 Missing and 16 partials ⚠️
pkg/nsx/services/dns/recordservice.go	79.62%	34 Missing and 20 partials ⚠️
pkg/controllers/service/service_lb_controller.go	39.28%	36 Missing and 15 partials ⚠️
...rd_party/externaldns/source/admission_hostnames.go	58.53%	39 Missing and 12 partials ⚠️
pkg/controllers/gateway/gateway_ip_cache.go	75.20%	22 Missing and 9 partials ⚠️
pkg/controllers/gateway/gc.go	60.25%	21 Missing and 10 partials ⚠️
...party/externaldns/source/route_parent_admission.go	73.00%	16 Missing and 11 partials ⚠️
... and 25 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1427      +/-   ##
==========================================
- Coverage   77.03%   77.02%   -0.01%     
==========================================
  Files         155      189      +34     
  Lines       22043    25052    +3009     
==========================================
+ Hits        16980    19297    +2317     
- Misses       3858     4339     +481     
- Partials     1205     1416     +211     

Flag	Coverage Δ
unit-tests	77.02% <76.99%> (-0.01%)	⬇️

Files with missing lines	Coverage Δ
pkg/controllers/common/types.go	100.00% <ø> (ø)
pkg/nsx/client.go	93.42% <100.00%> (+0.11%)	⬆️
pkg/nsx/services/common/policy_tree.go	86.48% <100.00%> (+0.24%)	⬆️
pkg/nsx/services/common/types.go	100.00% <ø> (ø)
pkg/nsx/services/dns/errors.go	100.00% <100.00%> (ø)
pkg/nsx/services/dns/types.go	100.00% <100.00%> (ø)
pkg/third_party/externaldns/endpoint/endpoint.go	100.00% <100.00%> (ø)
pkg/third_party/externaldns/source/hostnames.go	100.00% <100.00%> (ø)
..._party/externaldns/source/route_parent_accepted.go	100.00% <100.00%> (ø)
pkg/util/utils.go	87.12% <100.00%> (+0.12%)	⬆️
... and 35 more

... and 2 files with indirect coverage changes

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