Zanzana: Run OpenFGA HTTP server in standalone mode (#89914)

* Zanzana: Listen http to handle fga cli requests.

* make configurable

* start http server during service run

* wait for GRPC server is ready

* remove unnecessary logs

* fix linter errors

* run only in devenv

* make address configurable

pkg/setting/settings_zanzana.go

@@ -16,6 +16,10 @@ type ZanzanaSettings struct {
 	Addr string
 	// Mode can either be embedded or client
 	Mode ZanzanaMode
+	// ListenHTTP enables OpenFGA http server which allows to use fga cli
+	ListenHTTP bool
+	// OpenFGA http server address which allows to connect with fga cli
+	HttpAddr string
 }
 
 func (cfg *Cfg) readZanzanaSettings() {
@@ -32,6 +36,8 @@ func (cfg *Cfg) readZanzanaSettings() {
 	}
 
 	s.Addr = sec.Key("address").MustString("")
+	s.ListenHTTP = sec.Key("listen_http").MustBool(false)
+	s.HttpAddr = sec.Key("http_addr").MustString("127.0.0.1:8080")
 
 	cfg.Zanzana = s
 }