xilem_web: Add MemoizedStream view #2258

Job	Run time
cargo check (aarch64-android)	45s
cargo clippy (windows-latest)	7m 53s
cargo check (msrv) (wasm32)	23s
cargo check (msrv) (windows-latest)	3m 28s
cargo clippy (macos-latest)	3m 31s
cargo check (msrv) (macos-latest)	57s
cargo clippy (ubuntu-latest)	5m 34s
cargo clippy (wasm32)	3m 2s
cargo doc	41s
cargo check (msrv) (ubuntu-latest)	1m 15s
formatting	35s
Prime LFS Cache	9s
cargo test (wasm32)	39s
typos	4s
cargo test (windows-latest)	5m 33s
cargo test (macos-latest)	2m 25s
cargo test (ubuntu-latest)	4m 41s
	41m 35s

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