feat: basic functionality implemented

- added Core CRD to manage DB migrations & configuration, PostgREST and
  GoTrue (auth)
- added APIGateway CRD to manage Envoy proxy
- added Dashboard CRD to manage (so far) pg-meta and (soon) studio
  deployments
- implemented basic Envoy control plane based on K8s watcher

internal/jwk/set.go

@@ -0,0 +1,9 @@
+package jwk
+
+type Key interface {
+	SymmetricKey
+}
+
+type Set[T Key] struct {
+	Keys []T `json:"keys"`
+}