xilem_web: Add MemoizedStream view #2257

Job	Run time
cargo clippy (wasm32)	44s
cargo clippy (windows-latest)	1m 14s
cargo clippy (macos-latest)	1m 19s
cargo check (msrv) (wasm32)	22s
formatting	31s
cargo clippy (ubuntu-latest)	12s
cargo check (aarch64-android)	27s
Prime LFS Cache	3s
cargo test (wasm32)	18s
cargo check (msrv) (windows-latest)	2m 16s
cargo check (msrv) (macos-latest)	47s
cargo doc	31s
typos	5s
cargo check (msrv) (ubuntu-latest)	44s
cargo test (windows-latest)	2m 32s
cargo test (macos-latest)	44s
cargo test (ubuntu-latest)	1m 10s
	13m 59s

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