Add `zstack` view to compose views on top of each other #2482

Job	Run time
cargo clippy (wasm32)	1m 59s
cargo check (aarch64-android)	27s
cargo check (msrv) (wasm32)	21s
cargo check (msrv) (windows-latest)	1m 59s
cargo clippy (windows-latest)	1m 2s
cargo check (msrv) (macos-latest)	32s
cargo clippy (macos-latest)	1m 1s
cargo doc	40s
cargo check (msrv) (ubuntu-latest)	40s
formatting	33s
cargo clippy (ubuntu-latest)	1m 15s
Prime LFS Cache	4s
typos	8s
cargo test (wasm32)	18s
cargo test (windows-latest)	3m 1s
cargo test (macos-latest)	1m 48s
cargo test (ubuntu-latest)	2m 59s
	18m 47s

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