Add TS error deltas against consumers of arktype to CI

[ssalbdivad]

Would be a good way to identify breaking API changes or evaluate impact:

https://github.com/microsoft/typescript-error-deltas

[LukeAbby]

Note to anyone following this issue: If you look into this PLEASE ensure you sandbox this. If you don't it could install some compromised package with a malicious lifecycle script (e.g. preinstall) that would trigger and run arbitrary code.