Add set_mouse_pass_through and is_foreground_window #5778

Job	Run time
cargo clippy+test (gtk)	3m 45s
cargo fmt	22s
druid doctests	1m 9s
Docs (windows-latest)	2m 42s
mdbook build	15s
Docs (macos-latest)	1m 28s
cargo clippy+test (windows-latest)	3m 59s
Docs (ubuntu-latest)	3m 49s
cargo test (wasm32)	2m 12s
cargo clippy+test (macos-latest)	2m 59s
cargo clippy+test (wayland)	2m 58s
cargo clippy+test (ubuntu-latest)	3m 21s
	28m 59s

Provide feedback