Add support for private gateway (#154)

This change adds support for TCPRoutes when using a private gateway
class. This is similar to annotating services today. It also moves the
gateway classes to the Helm chart as it makes things a lot simpler for
the end user as they no longer have to define them.

Signed-off-by: Philip Laine <philip.laine@gmail.com>

examples/gateway-api/nginx.yaml

@@ -0,0 +1,61 @@
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: nginx
+  namespace: default
+  labels:
+    app: nginx
+spec:
+  hostnames:
+  - nginx-test-app.eu1.netbird.services
+  parentRefs:
+  - name: public
+    namespace: netbird
+  rules:
+    - backendRefs:
+        - name: nginx
+          port: 80
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nginx
+  namespace: default
+  labels:
+    app: nginx
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: nginx
+  strategy:
+    rollingUpdate:
+      maxSurge: 25%
+      maxUnavailable: 25%
+    type: RollingUpdate
+  template:
+    metadata:
+      labels:
+        app: nginx
+    spec:
+      containers:
+      - image: nginx
+        imagePullPolicy: Always
+        name: nginx
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: nginx
+  namespace: default
+  labels:
+    app: nginx
+spec:
+  type: ClusterIP
+  ports:
+  - name: http
+    port: 80
+    protocol: TCP
+    targetPort: 80
+  selector:
+    app: nginx