Add set_mouse_pass_through and is_foreground_window #5774

Job	Run time
cargo clippy+test (gtk)	1m 21s
druid doctests	42s
mdbook build	20s
Docs (windows-latest)	1m 19s
cargo fmt	13s
Docs (macos-latest)	53s
cargo clippy+test (windows-latest)	50s
Docs (ubuntu-latest)	3m 44s
cargo test (wasm32)	34s
cargo clippy+test (wayland)	1m 17s
cargo clippy+test (macos-latest)	46s
cargo clippy+test (ubuntu-latest)	1m 3s
	13m 2s

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