protobuf dsl compiler does not create type definitions for enums

[shidel-dev]

Method signatures which return an enum are generated correctly, but no definitions of the enums themselves are generated.

There is an example of this in the test suite already

tapioca/spec/tapioca/compilers/dsl/protobuf_spec.rb

Line 151 in afcecf2

add_ruby_file("protobuf.rb", <<~RUBY)

No rbi is generated for Cart::VALUE_TYPE which will result in type errors (Unable to resolve constant)

[shidel-dev]

Enum descriptors can be identified with:
ObjectSpace.each_object(Google::Protobuf::EnumDescriptor)