remote manifest push: show copy progress

`podman-remote manifest push` has shown absolutely no progress at all.
Fix that by doing the same as the remote-push code does.

Like remote-push, `quiet` parameter is true by default for backwards
compatibility.

Signed-off-by: Naoto Kobayashi <naoto.kobayashi4c@gmail.com>

pkg/api/server/register_manifest.go

@@ -75,6 +75,11 @@ func (s *APIServer) registerManifestHandlers(r *mux.Router) error {
 	//    type: boolean
 	//    default: true
 	//    description: Require HTTPS and verify signatures when contacting registries.
+	//  - in: query
+	//    name: quiet
+	//    description: "silences extra stream data on push"
+	//    type: boolean
+	//    default: true
 	// responses:
 	//   200:
 	//     schema: