gateway api: support RouteNamespaces

Co-authored-by: Jean-Baptiste Doumenjou <925513+jbdoumenjou@users.noreply.github.com>

pkg/provider/kubernetes/gateway/fixtures/services.yml

@@ -33,6 +33,42 @@ subsets:
       - name: web2
         port: 8000
 
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: whoami-bar
+  namespace: bar
+
+spec:
+  ports:
+    - name: web2
+      port: 8000
+      targetPort: web2
+    - name: web
+      port: 80
+      targetPort: web
+  selector:
+    app: containous
+    task: whoami
+
+---
+kind: Endpoints
+apiVersion: v1
+metadata:
+  name: whoami-bar
+  namespace: bar
+
+subsets:
+  - addresses:
+      - ip: 10.10.0.11
+      - ip: 10.10.0.12
+    ports:
+      - name: web
+        port: 80
+      - name: web2
+        port: 8000
+
 ---
 apiVersion: v1
 kind: Service
@@ -164,7 +200,6 @@ spec:
       protocol: TCP
       port: 443
 
-
 ---
 kind: Endpoints
 apiVersion: v1
@@ -199,3 +234,38 @@ spec:
     - protocol: TCP
       port: 10000
       name: tcp-2
+
+---
+kind: Endpoints
+apiVersion: v1
+metadata:
+  name: whoamitcp-bar
+  namespace: bar
+
+subsets:
+  - addresses:
+      - ip: 10.10.0.13
+      - ip: 10.10.0.14
+    ports:
+      - name: tcp-1
+        protocol: TCP
+        port: 9000
+      - name: tcp-2
+        protocol: TCP
+        port: 10000
+
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: whoamitcp-bar
+  namespace: bar
+
+spec:
+  ports:
+    - protocol: TCP
+      port: 9000
+      name: tcp-1
+    - protocol: TCP
+      port: 10000
+      name: tcp-2