Initial commit of piet-next API sketch #1619

Job	Run time
cargo clippy (windows-latest)	1m 33s
cargo check (msrv) (wasm32)	24s
cargo clippy (macos-latest)	1m 23s
cargo clippy (wasm32)	55s
cargo check (msrv) (windows-latest)	1m 19s
cargo clippy (ubuntu-latest)	1m 46s
cargo check (msrv) (macos-latest)	31s
compare snapshots (windows-latest)	1m 21s
cargo check (msrv) (ubuntu-latest)	46s
cargo doc (windows-latest)	39s
compare snapshots (macos-latest)	32s
cargo doc (macos-latest)	39s
formatting	28s
compare snapshots (ubuntu-latest)	35s
cargo doc (ubuntu-latest)	56s
cargo test (windows-latest)	1m 45s
cargo test (wasm32)	40s
cargo test (macos-latest)	32s
typos	4s
cargo test (ubuntu-latest)	1m 8s
	17m 56s

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