Implement @rust.Name on consts

Summary: Might as well. This is easier than documenting why it is not supported.

Reviewed By: diliop

Differential Revision: D71597221

fbshipit-source-id: 75b57ed91b2aa397d3bee73dcd9f1b497285a341

Author: David Tolnay

thrift/annotation/rust.thrift

@@ -24,15 +24,7 @@ namespace py.asyncio facebook_thrift_asyncio.annotation.rust
 namespace go thrift.annotation.rust
 namespace py thrift.annotation.rust
 
-// This is scope.Definition minus scope.Const
-@scope.Function
-@scope.EnumValue
-@scope.Enum
-@scope.Structured
-@scope.Field
-@scope.Typedef
-@scope.Service
-@scope.Interaction
+@scope.Definition
 struct Name {
   // # `rust.Name`
   //