Reserving a declaration for the Impress proto plugin.

PiperOrigin-RevId: 835386232

Author: protobuf-github-bot

src/google/protobuf/descriptor.proto

@@ -1185,6 +1185,11 @@ message FeatureSet {
       full_name: ".pb.python",
       type: ".pb.PythonFeatures"
     },
+    declaration = {
+      number: 1100,
+      full_name: ".imp.impress_feature_set",
+      type: ".imp.ImpressFeatureSet"
+    },
     declaration = {
       number: 9989,
       full_name: ".pb.java_mutable",