Initial commit of piet-next API sketch #1617

Job	Run time
cargo clippy (wasm32)	45s
formatting	22s
cargo check (msrv) (windows-latest)	2m 45s
cargo check (msrv) (wasm32)	46s
cargo check (msrv) (macos-latest)	1m 1s
cargo clippy (windows-latest)	46s
cargo check (msrv) (ubuntu-latest)	1m 36s
compare snapshots (windows-latest)	1m 34s
cargo clippy (macos-latest)	47s
cargo doc (windows-latest)	39s
cargo clippy (ubuntu-latest)	1m 2s
compare snapshots (macos-latest)	54s
cargo doc (macos-latest)	39s
compare snapshots (ubuntu-latest)	53s
cargo test (windows-latest)	1m 49s
cargo doc (ubuntu-latest)	54s
cargo test (wasm32)	50s
typos	6s
cargo test (macos-latest)	54s
cargo test (ubuntu-latest)	1m 32s
	20m 34s

Provide feedback