Make compiled ruby source use frozen string literals

[ledhed2222]

What language does this apply to?
Applies to ruby generated code

Describe the problem you are trying to solve.
In ruby, string literals are (unfortunately) mutable. This comes with a memory penalty. There is a magic comment you can use at the top of any ruby file to opt-out of this for the file only:

# frozen_string_literal: true

....

I think it would be cool if protoc output ruby in this manner, albeit mostly because this is a best practice. I'd be shocked if this had any real-world performance gains.

As far as I can tell, the protoc compiler never makes use of the theoretical mutability of ruby strings, as it ought not to. Therefore it should not even be an option; all compiled ruby should have mutable strings turned off.

Describe the solution you'd like
Every ruby compiled source file (*_pb.rb) should have the magic comment described above at the top.

Describe alternatives you've considered
N/A

Additional context
I'd be happy to do this if you guys agree :)

[noahmatisoff]

I made the change in #7888, curious if the protobuf team will want it to be an option when doing codegen however.

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