Add SDL3 Controller Support

[RobLoach]

This is initial support on SDL3 Controller support. Using SDL3 will mean disabling the other SDL drivers, since the APIs are not backwards compatible. I've split it into its own sdl3_joypad.c since the API is quite different than previous iterations.

TODO

• Testing
• Add any missing features, like haptics/rumble gain? https://wiki.libsdl.org/SDL3/CategoryHaptic
• Verify max values of axis https://wiki.libsdl.org/SDL3/SDL_JOYSTICK_AXIS_MAX
• Determine if we want to add other SDL3 Drivers as part of this, like the input
• Player index SDL_GetGamepadPlayerIndex
• Figure out what to do for autoconfig sdl3: Add Xbox 360 Controller retroarch-joypad-autoconfig#1305

References

• SDL 3 Autoconfig PR
• Fixes SDL3 Input Support #18441

Test

1. Compile RetroArch with SDL3 support

   ./configure --enable-sdl3
   make
   ./retroarch --verbose
   

2. Once in, switch the Controller driver to sdl3 (Menu > Input > Controller > sdl3)
3. Restart to load up with the SDL3 Controller Driver

[RobLoach]

This the right way to set these configurations? https://wiki.libsdl.org/SDL3/README-migration

[PoloniumRain]

It looks correct to me