Add `zstack` view to compose views on top of each other #2244

Job	Run time
cargo check (aarch64-android)	21s
cargo check (msrv) (windows-latest)	3m 29s
cargo clippy (windows-latest)	8m 32s
cargo check (msrv) (wasm32)	21s
cargo check (msrv) (macos-latest)	1m 37s
cargo clippy (macos-latest)	3m 42s
cargo clippy (wasm32)	3m 11s
cargo check (msrv) (ubuntu-latest)	1m 39s
cargo clippy (ubuntu-latest)	5m 34s
cargo doc	44s
formatting	56s
Prime LFS Cache	6s
cargo test (wasm32)	30s
typos	5s
cargo test (windows-latest)	4m 19s
cargo test (macos-latest)	2m 17s
cargo test (ubuntu-latest)	4m 15s
	41m 38s

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