This swap does a few cool things:

• We can now have multiple spinners / progress indicators at the same time
• We can associate output with a running task (thing piping a spawned process)
• Tasks are now semantically ordered and we can visually indicate "subtasks"
• It looks cooler ✨ 😎

This refactor can be done bit-by-bit, this PR tackles the top level checkSystem command and the init + start subcommands. Other commands can be ported ad-hoc with the exception of packager which shouldn't be ported until #3006 lands or is in a state to be cherry-picked.

api/core already depended on listr2 as well so this doesn't add anything to our dependency tree.

Screenshots

Init with template-webpack

Start with native module failure

Start with plugin-webpack