xilem_web: Add MemoizedStream view #2485

Job	Run time
cargo clippy (wasm32)	3m 33s
cargo check (msrv) (windows-latest)	2m 57s
cargo check (msrv) (wasm32)	24s
cargo clippy (windows-latest)	7m 0s
cargo check (msrv) (macos-latest)	1m 18s
cargo clippy (macos-latest)	3m 46s
cargo check (aarch64-android)	1m 3s
cargo check (msrv) (ubuntu-latest)	1m 24s
cargo clippy (ubuntu-latest)	5m 11s
cargo doc	1m 59s
formatting	36s
cargo test (wasm32)	54s
typos	5s
Prime LFS Cache	4s
cargo test (windows-latest)	4m 53s
cargo test (macos-latest)	2m 28s
cargo test (ubuntu-latest)	4m 46s
	42m 21s

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