[ruby-core:112475] [Ruby master Bug#19447] Merge `internal/rgengc.h` into public `internal/gc.h` header

Issue #19447 has been reported by eightbitraptor (Matthew Valentine-House).

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Bug #19447: Merge `internal/rgengc.h` into public `internal/gc.h` header
https://bugs.ruby-lang.org/issues/19447

* Author: eightbitraptor (Matthew Valentine-House)
* Status: Open
* Priority: Normal
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
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[[Github PR #7310](https://github.com/ruby/ruby/pull/7310)]

This PR merges the `rgengc.h` internal header into the public internal `gc.h` header.

`rgengc.h` was introduced as part of this commit `9e6e39c3512f7a962c44dc3729c98a0f8be90341` when `ruby.h` was split apart. It mostly contains macros for enabling the write barrier on objects, 

I have merged this into `include/ruby/internal/gc.h` in order to keep the internal GC api spread across as few places as possible.

I don't believe that this will cause a problem with C extensions despite the removal of a public header file. Both `include/ruby/internal/rgengc.h` and `include/ruby/internal/gc.h` were both included from `ruby/ruby.h` and so every C extension that `#include <ruby/ruby.h>` already has access to their definitions. 

I think that the only case there would be a problem is if a user had explicitly `#include <ruby/internal/rgengc.h>` which is unneccesary if they've already included `<ruby/ruby.h>`.



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