split **/pkg/config/config.go up to multiple files

settings/pkg/config/grpc.go

@@ -0,0 +1,7 @@
+package config
+
+// GRPC defines the available grpc configuration.
+type GRPC struct {
+	Addr      string `ocisConfig:"addr" env:"SETTINGS_GRPC_ADDR"`
+	Namespace string
+}