Add command to reset/remove entire project

[treysp]

Delete all engine objects (state and warehouse), caches

[serkef]

yes that would be very useful for people who do PoCs and are in the pre-prod phase. I've found myself deleting state db and wh more than once.

[Happily-Coding]

It would also be great if that command could be run for a particular table and all its dependencies, instead of having to manually delete sqlmesh used / created tables / views