Add Kubernetes Gateway Provider

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

docs/content/reference/dynamic-configuration/kubernetes-gateway-simple-https.yml

@@ -0,0 +1,48 @@
+---
+kind: GatewayClass
+apiVersion: networking.x-k8s.io/v1alpha1
+metadata:
+  name: my-gateway-class
+spec:
+  controller: traefik.io/gateway-controller
+
+---
+kind: Gateway
+apiVersion: networking.x-k8s.io/v1alpha1
+metadata:
+  name: my-gateway
+spec:
+  gatewayClassName: my-gateway-class
+  listeners:
+    - protocol: HTTPS
+      port: 443
+      tls:
+        certificateRef:
+          group: "core"
+          kind: "Secret"
+          name: "mysecret"
+      routes:
+        kind: HTTPRoute
+        selector:
+          matchLabels:
+            app: foo
+---
+kind: HTTPRoute
+apiVersion: networking.x-k8s.io/v1alpha1
+metadata:
+  name: http-app-1
+  namespace: default
+  labels:
+    app: foo
+spec:
+  hostnames:
+    - "whoami"
+  rules:
+    - matches:
+        - path:
+            type: Exact
+            value: /foo
+      forwardTo:
+        - serviceName: whoami
+          port: 80
+          weight: 1