[Bindings] Build profile now strips methods and skip files

[Faless]

This allows removing dependencies that are not explicitly unused by the gdextension being built and is implemented using an intermediate json API file with the methods and classes stripped (i.e. without touching the file generators).

Alternative to #1675

[Faless]

I've further extracted the functions related to build profiles into a dedicated tool (build_profile.py) that can also be invoked as standalone to generate the trimmed API (either saving it to file or printing it to stdout)

[dsnopek]

@Faless Between this PR and #1675, which is your preference?

The experience for users of scons is the same, and it sounds (from the discussion on the other PR) like either approach is fine for CMake as well.

I'm personally fine with either, although, I guess this PR has some theoretical advantages, like other language bindings could use it, or if maybe there start being other tools that interact with extension_api.json files.

[Faless]

Between this PR and #1675, which is your preference?

I wasn't really convinced by this approach at first, but after a couple of iteration I think it's now better than the other, and indeed it should be usable as a standalone tool by other bindings. I'll close the other PR.

[dsnopek]

This looks really great to me!

In the past, we've discussed that adding the ability to exclude methods would be impractical because you'd need to list all the methods, but this approach is a very nice compromise.

I tested with the test project here, and the godot_openxr_vendors extension, and the debug binaries were about ~200k and ~400k smaller, respectively.

Other than the one issue I noted with 'godot_openxr_vendors' below, it seemed to work great! I skimmed the code, and that's looking good too

[dsnopek]

Thanks! LGMT :-)