Add support for ReplacePrefixMatch on URLRewrite filters (Gateway Api)

[jduepmeier]

Is your feature request related to a problem? Please describe.

Hello,

I like to use the ReplacePrefixMatch feature on URLRewrite filters of the gateway api.
Currently only ReplaceFullPath is supported.

Example Usage:

---
apiVersion: gateway.networking.k8s.io/v1
kind: HTTPRoute
metadata:
  name: test
spec:
  hostnames:
    - domain.local
  parentRefs:
    - group: gateway.networking.k8s.io
      kind: Gateway
      name: gateway
  rules:
    - backendRefs:
        - group: ""
          kind: Service
          name: backend-service
          port: 80
      matches:
        - path:
            type: PathPrefix
            value: /
    - backendRefs:
        - group: ""
          kind: Service
          name: other-service
          port: 80
      matches:
        - path:
            type: PathPrefix
            value: /other
      filters:
        - type: URLRewrite
          urlRewrite:
            hostname: other-domain.local
            path:
              type: ReplacePrefixMatch
              replacePrefixMatch: /

This sends every path under /other to the other backend service. It removes the /other path prefix from the requests.

Describe the solution you'd like

Implement ReplacePrefixMatch for HTTPRoute URLRewrite filters.

Describe alternatives you've considered

• Strip the prefix inside the application. This is only possible if the application supports it (which is often not the case).
• Route the request though another reverse proy which supports the rewrite. This adds additional overhead.

Additional context

Link to documention for URLRewrite: https://gateway-api.sigs.k8s.io/guides/http-redirect-rewrite/#rewrites
Api Documentation: https://gateway-api.sigs.k8s.io/reference/spec/#httppathmodifier

[m-castaldo]

Could also do with this implementation into AKO as without it its quite limiting for me