Add `zstack` view to compose views on top of each other #2468

Job	Run time
cargo check (aarch64-android)	24s
cargo check (msrv) (wasm32)	16s
cargo check (msrv) (windows-latest)	2m 2s
cargo clippy (windows-latest)	4m 44s
cargo check (msrv) (macos-latest)	41s
cargo clippy (macos-latest)	2m 18s
cargo check (msrv) (ubuntu-latest)	37s
cargo clippy (wasm32)	1m 55s
cargo clippy (ubuntu-latest)	3m 14s
cargo doc	39s
formatting	43s
cargo test (wasm32)	21s
typos	5s
Prime LFS Cache	9s
cargo test (windows-latest)	3m 42s
cargo test (macos-latest)	1m 45s
cargo test (ubuntu-latest)	3m 18s
	26m 53s

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