Initial commit of piet-next API sketch #1629

Job	Run time
cargo clippy (windows-latest)	3m 49s
cargo clippy (macos-latest)	1m 43s
cargo clippy (ubuntu-latest)	2m 51s
cargo check (msrv) (wasm32)	1m 7s
cargo clippy (wasm32)	1m 49s
cargo check (msrv) (windows-latest)	2m 22s
cargo doc (windows-latest)	1m 55s
cargo check (msrv) (macos-latest)	1m 10s
formatting	19s
cargo doc (macos-latest)	1m 1s
cargo check (msrv) (ubuntu-latest)	1m 45s
cargo test (windows-latest)	1m 54s
cargo doc (ubuntu-latest)	1m 49s
cargo test (macos-latest)	1m 3s
cargo test (wasm32)	1m 9s
cargo test (ubuntu-latest)	1m 49s
compare snapshots (windows-latest)	1m 51s
compare snapshots (macos-latest)	43s
typos	3s
compare snapshots (ubuntu-latest)	1m 27s
	31m 39s

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