Rate limiting limits controller

[eguzki]

What

Custom controller for Limitador limits reading from DAG Gateway API topology and RateLimitPolicies

Limitador cluster envoy filter controller reading from DAG Gateway API topology and RateLimitPolicies

Kuadrant rate limiting controllers no longer depends on back references annotation: kuadrant.io/ratelimitpolicies. Instead, controllers rely on the DAG Gateway API topopology to read cluster state. Kuadrant rate limiting controller responsible for the limitador's limits is also based on this approach. So is the limitador cluster envoy filter controller

Fix reconciliation event blind spots due to race conditions or timing issues. The reconciled resource reflects latest updates from the cluster (Gateways, Routes and policies).

Work being done as part of #530

[codecov]

Codecov Report

Attention: Patch coverage is 77.26397% with 118 lines in your changes missing coverage. Please review.

Project coverage is 57.97%. Comparing base (ece13e8) to head (8e433e2).
Report is 124 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #527       +/-   ##
===========================================
- Coverage   80.20%   57.97%   -22.24%     
===========================================
  Files          64       80       +16     
  Lines        4492     5973     +1481     
===========================================
- Hits         3603     3463      -140     
- Misses        600     2173     +1573     
- Partials      289      337       +48     

Flag	Coverage Δ
bare-k8s-integration	4.72% <2.69%> (?)
gatewayapi-integration	14.18% <24.66%> (?)
integration	?
istio-integration	56.57% <76.68%> (?)
unit	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
api/v1beta1 (u)	71.42% <ø> (ø)
api/v1beta2 (u)	69.48% <64.44%> (-21.95%)	⬇️
pkg/common (u)	18.03% <ø> (-70.80%)	⬇️
pkg/istio (u)	63.23% <ø> (-10.69%)	⬇️
pkg/log (u)	57.89% <ø> (-36.85%)	⬇️
pkg/reconcilers (u)	∅ <ø> (∅)
pkg/rlptools (u)	77.21% <ø> (-2.24%)	⬇️
controllers (i)	58.23% <74.02%> (-18.57%)	⬇️

Files	Coverage Δ
api/v1beta2/ratelimitpolicy_types.go	63.79% <ø> (-25.30%)	⬇️
controllers/gateway_kuadrant_controller.go	83.13% <100.00%> (+2.00%)	⬆️
controllers/ratelimitpolicy_backreferences.go	100.00% <100.00%> (ø)
controllers/test_common.go	100.00% <100.00%> (ø)
...lers/ratelimitpolicy_enforced_status_controller.go	82.82% <88.88%> (ø)
pkg/common/common.go	22.58% <0.00%> (-71.17%)	⬇️
...ollers/limitador_cluster_envoyfilter_controller.go	77.66% <89.28%> (-4.15%)	⬇️
pkg/library/mappers/gateway_to_kuadrant.go	78.57% <78.57%> (ø)
pkg/library/mappers/policy_to_gateway.go	64.70% <70.00%> (ø)
pkg/library/mappers/httproute_to_kuadrant.go	79.16% <79.16%> (ø)
... and 8 more

... and 43 files with indirect coverage changes

[eguzki]

Closing in favor of #893

I leave the branch undeleted because there are some integration tests that can be backported