xilem_web: Add MemoizedStream view #2249

Job	Run time
cargo check (msrv) (wasm32)	18s
cargo check (aarch64-android)	24s
cargo clippy (windows-latest)	8m 4s
cargo check (msrv) (windows-latest)	2m 36s
cargo clippy (macos-latest)	3m 50s
cargo check (msrv) (macos-latest)	1m 1s
cargo clippy (wasm32)	3m 8s
cargo clippy (ubuntu-latest)	5m 26s
cargo doc	39s
cargo check (msrv) (ubuntu-latest)	1m 41s
formatting	32s
Prime LFS Cache	3s
typos	6s
cargo test (wasm32)	20s
cargo test (windows-latest)	4m 5s
cargo test (macos-latest)	1m 46s
cargo test (ubuntu-latest)	3m 48s
	37m 47s

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