This makes it possible to suppress linting rules 👍🏻

They mostly work likebiome's suppressions, except that you don'thave to provide an explanation, and you can use multiple suppressions above a diagnostic:

-- pgt-ignore lint/safety/banDropNotNull-- pgt-ignore lint/safety/banDropTable<query causing both diagnostics>

We can't suppress type-check diagnostics yet, but I'd like to implement that in a future PR.
Suppressing typechecks and other diagnostics was easier than I thought, so I added it to this PR

Also, we need to add this to the docs – also future PR!