Add return types for callbacks in Ripper::SexpBuilder

[apiology]

No description provided.

[apiology]

I wasn't quite sure how to test callbacks like these with your tooling - open to ideas!

[apiology]

These two patterns of callbacks are defined here:

https://github.com/ruby/ruby/blob/master/ext/ripper/lib/ripper/sexp.rb#L116-L131

[apiology]

This change is limited as I'm not terribly familiar with Ripper. These changes will help https://github.com/castwide/solargraph pass its own typechecking; here's the use it makes of Ripper: https://github.com/castwide/solargraph/blob/41b892397be99fd6b445d1e308a3f512c5ec32e9/lib/solargraph/parser/comment_ripper.rb#L4

cc: @aamine in case you have thoughts

[apiology]

Should I push up additional fixes to RBS types?

[ksss]

@apiology
Thank you for requesting.
There are many changes and we are finding it difficult to confirm each one.
Can you provide a test code?

[apiology]

I'm sorry - I don't know how to test callbacks like these with your tooling. Do you have any ideas? A small example and I can fill in the rest.

[apiology]

If it helps, I am successfully using my fork of this repo to typecheck this file: https://github.com/castwide/solargraph/blob/0e82bbdcc9da7343dd028373797f2fe0373dbf6a/lib/solargraph/parser/comment_ripper.rb