cmd/k8s-operator,k8s-operator,kube: Add TSRecorder CRD + controller (#13299)

cmd/k8s-operator,k8s-operator,kube: Add TSRecorder CRD + controller

Deploys tsrecorder images to the operator's cluster. S3 storage is
configured via environment variables from a k8s Secret. Currently
only supports a single tsrecorder replica, but I've tried to take early
steps towards supporting multiple replicas by e.g. having a separate
secret for auth and state storage.

Example CR:

```yaml
apiVersion: tailscale.com/v1alpha1
kind: Recorder
metadata:
  name: rec
spec:
  enableUI: true
```

Updates #13298

Signed-off-by: Tom Proctor <tomhjp@users.noreply.github.com>

k8s-operator/apis/v1alpha1/register.go

@@ -49,7 +49,16 @@ func init() {
 
 // Adds the list of known types to api.Scheme.
 func addKnownTypes(scheme *runtime.Scheme) error {
-	scheme.AddKnownTypes(SchemeGroupVersion, &Connector{}, &ConnectorList{}, &ProxyClass{}, &ProxyClassList{}, &DNSConfig{}, &DNSConfigList{})
+	scheme.AddKnownTypes(SchemeGroupVersion,
+		&Connector{},
+		&ConnectorList{},
+		&ProxyClass{},
+		&ProxyClassList{},
+		&DNSConfig{},
+		&DNSConfigList{},
+		&Recorder{},
+		&RecorderList{},
+	)
 
 	metav1.AddToGroupVersion(scheme, SchemeGroupVersion)
 	return nil