add canvas widget #2822

Job	Run time
cargo check (aarch64-android)	23s
cargo check (msrv) (wasm32)	24s
cargo check (msrv) (windows-latest)	1m 28s
cargo clippy (windows-latest)	27s
cargo clippy (wasm32)	1m 57s
cargo check (msrv) (macos-latest)	42s
cargo doc	1m 46s
cargo clippy (macos-latest)	25s
cargo check (msrv) (ubuntu-latest)	41s
cargo clippy (ubuntu-latest)	29s
formatting	35s
cargo miri (unsafe tree_arena)	49s
cargo test (wasm32)	24s
Prime LFS Cache	6s
typos	7s
cargo test (windows-latest)	3m 33s
cargo test (macos-latest)	1m 37s
cargo test (ubuntu-latest)	2m 42s
	18m 35s

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