Compile _sdl2.controller and _sdl2.touch with SDL3

[damusss]

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I have started working on compiling pygame._sdl2 with SDL3. This PR is draft because I'd like to port touch and audio, I'm creating it early to get feedback and opinions, especially for the following submodules:

• We don't have to port video, right? I mean, it's being ported as pygame.render which hopefully is already sdl3 compatible. No reason porting obsolete code to SDL3
• Same thing for window. pygame.window is already ported, there's not reason to port this too, since it's also outdated. Do you agree? (also I want to see what the checks have to say about my changes)

EDIT: I compiled and ported controller and touch. I have made small edits to prepare audio, which I will do in the next PR, so this one is easier to approve.

Summary by CodeRabbit

• New Features

  • Broad SDL3 compatibility for gamepad, touch, and header integration; re-exports SDL version info via pygame._sdl2.

• Bug Fixes

  • Improved error handling, bounds checking, and clearer exceptions for device/finger access.
  • Tighter memory management when querying devices/fingers.
  • More explicit success/failure signaling for rumble and LED controls.

• Chores

  • Build and meson changes to conditionally include legacy SDL2 modules and always build core _sdl2; audio/video imports skipped on SDL3.