fix: support for nested messages and enums within group blocks

[JoshuaWise]

This fixes support for proto files that have nested messages or enums declared within groups, like this:

syntax = "proto2";

message Foo {
  repeated group Field = 1 {
    message Bar {
      optional bool my_bool = 2;
    }

    optional string my_string = 3;
    optional Bar my_bar = 4;
  }
}

[alexander-fenster]

Hi @JoshuaWise, could you give me access to your branch (there should be a checkbox that allows contributors to edit the code) so I could run the CI and fix failures if there are any? A little bit scared to merge this without seeing the tests pass.

Alternatively, you might be able to update your fork to point to the latest head of the repository, which will hopefully make GitHub run tests for this PR.

[codenirvana]

Hey @alexander-fenster, Josh is unavailable this month. I am the maintainer of the fork.
I tried rebasing the branch with protobufjs:master but looks like that didn’t help. 😞

[alexander-fenster]

It did help! I was able to run tests now (I needed to approve the workflow by hitting a button, but the button just did not exist before you update the branch). Let's see what happens!

[codenirvana]

Awesome!

Also, tests passed. 🎉