GdkWin32: Add support for DirectManipulation

Add support for Precision Touchpads (PTPs) via DirectManipulation

• Adds support for GdkTouchpadEvent
  • ✔ Pinch gestures
  • ➖ Swipe gestures with 3+ fingers not supported as 3+ fingers gestures are reserved for the OS. Instead 2 fingers swipes are reported as scroll events, just like as GTK4 on Linux with libinput
  • ✔ Hold gestures will be added in a separate MR
• Adds support for GdkScrollEvent with surface (i.e pixel) units, for an even smoother scrolling experience
  • ✔ enables scroll sequence stop reporting

References:

• https://wayland.freedesktop.org/libinput/doc/latest/gestures.html
• https://docs.microsoft.com/en-us/previous-versions/windows/desktop/directmanipulation/direct-manipulation-portal