Replace `mach` crate with `mach2` #4

Job	Run time
Build (macos-latest, stable, default)	39s
Build (macos-latest, stable, --features 'chains sm-raw-window-handle', default)	48s
Build (ubuntu-22.04, stable, default)	24s
Build (ubuntu-22.04, stable, --features 'chains sm-raw-window-handle', default)	28s
Build (windows-latest, stable, default)	58s
Build (windows-latest, stable, --features 'chains sm-raw-window-handle', default)	56s
Build (ubuntu-22.04, --features sm-wayland-default, stable, default)	28s
Build (ubuntu-22.04, arm-linux-androideabi, stable)	33s
Build (windows-latest, --features 'chains sm-angle-builtin', stable, default)	5m 37s
Build (windows-latest, --features 'chains sm-no-wgl sm-angle-builtin', stable, default)	5m 56s
Build (windows-latest, aarch64-pc-windows-msvc, stable)	43s
Result	1s
	17m 31s

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