Add set_mouse_pass_through and is_foreground_window #5779

Job	Run time
cargo fmt	12s
cargo clippy+test (gtk)	1m 9s
druid doctests	40s
Docs (windows-latest)	1m 39s
mdbook build	19s
Docs (macos-latest)	42s
cargo clippy+test (windows-latest)	1m 55s
cargo test (wasm32)	1m 17s
Docs (ubuntu-latest)	1m 24s
cargo clippy+test (macos-latest)	1m 12s
cargo clippy+test (ubuntu-latest)	1m 23s
cargo clippy+test (wayland)	1m 15s
	13m 7s

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