[Feature Request] Configurable rumble for dual-motor controllers

add a configuration for rumble motors - useful for controllers with two rumble motors (PlayStation, Xbox, Nintendo Switch Joy-Con controllers)

for example under RA main menu > Input > Haptic Feedback/Vibration add a settings for Rumble Motors
explanation text: setting to control which rumble motors to use for controllers with dual motors

selectable options:

• Core Provided - the core will choose, useful for systems with native dual-motors like PS1 and PS2, Xbox, where the game being played will choose. Also see note*
• Small Motor Only
• Large Motor Only
• Both Motors In Sync Only - both motors rumble in sync

*note: Other cores could be upgraded to provide "hints" to RetroArch, to match the original hardware motors. For example:

• Game Boy Color cores = small motor only
• Dolphin when playing a GameCube game = both motors in sync
• Dolphin when playing a Wii game = small motor only (to match the Wiimote's small motor)
• N64 and Dreamcast cores = both motors in sync

Start at RetroArch's main menu path Input > Haptic Feedback/Vibration and review how rumble settings are currently represented. Done means adding a Rumble Motors setting with the four requested options and supporting the stated dual-motor behaviors, including core-provided selection.