Add `zstack` view to compose views on top of each other #2467

Job	Run time
cargo check (aarch64-android)	21s
cargo check (msrv) (wasm32)	21s
cargo clippy (windows-latest)	30s
cargo check (msrv) (windows-latest)	1m 49s
cargo clippy (macos-latest)	27s
cargo clippy (wasm32)	1m 54s
cargo check (msrv) (macos-latest)	32s
cargo clippy (ubuntu-latest)	28s
cargo doc	1m 59s
cargo check (msrv) (ubuntu-latest)	43s
formatting	34s
Prime LFS Cache	5s
cargo test (wasm32)	19s
typos	6s
cargo test (windows-latest)	4m 26s
cargo test (macos-latest)	1m 34s
cargo test (ubuntu-latest)	2m 53s
	19m 1s

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