Add `zstack` view to compose views on top of each other #2481

Job	Run time
cargo check (msrv) (wasm32)	15s
cargo check (aarch64-android)	21s
cargo clippy (windows-latest)	52s
cargo check (msrv) (windows-latest)	1m 42s
cargo clippy (macos-latest)	56s
cargo check (msrv) (macos-latest)	35s
cargo clippy (wasm32)	2m 1s
cargo clippy (ubuntu-latest)	1m 11s
cargo doc	2m 2s
cargo check (msrv) (ubuntu-latest)	43s
formatting	34s
Prime LFS Cache	5s
cargo test (wasm32)	18s
typos	6s
cargo test (windows-latest)	2m 38s
cargo test (macos-latest)	40s
cargo test (ubuntu-latest)	53s
	15m 52s

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