Initial commit of piet-next API sketch #1620

Job	Run time
formatting	21s
cargo clippy (windows-latest)	3m 0s
cargo check (msrv) (wasm32)	35s
cargo clippy (macos-latest)	1m 3s
cargo check (msrv) (windows-latest)	1m 28s
cargo clippy (wasm32)	1m 23s
cargo clippy (ubuntu-latest)	2m 9s
cargo check (msrv) (macos-latest)	39s
compare snapshots (windows-latest)	1m 4s
cargo check (msrv) (ubuntu-latest)	46s
compare snapshots (macos-latest)	24s
cargo doc (windows-latest)	1m 58s
cargo test (windows-latest)	1m 24s
compare snapshots (ubuntu-latest)	47s
cargo doc (macos-latest)	55s
cargo test (wasm32)	47s
cargo test (macos-latest)	43s
cargo doc (ubuntu-latest)	1m 35s
cargo test (ubuntu-latest)	52s
typos	4s
	21m 57s

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