Emit Android joystick axes as AxisMotion events

[brianconnoly]

Summary

• route Android joystick/gamepad MotionEvent samples before the touch path
• emit WindowEvent::AxisMotion for common joystick, hat and analog trigger axes
• keep touch handling unchanged for non-joystick MotionEvent sources

This lets Android gamepad sticks, D-pad hats and analog triggers reach applications through Winit axis events instead of being dropped as unhandled motion input.

Validation

• CARGO_TARGET_DIR=/Volumes/RustBuilds/vibe-scrap-squad/target/winit-fork-upstream CARGO_INCREMENTAL=0 cargo check -p winit --target aarch64-linux-android --features android-native-activity

[brianconnoly]

Superseded by #4618, which carries the same Android joystick-axis work adapted to current master.