Don't use ast.json to drive typings

[josephjclark]

The current implementation uses ast.json to drive language services.

What's nice about ast.json is that every adaptor has one. Unfortunately it's quite a limited structure. It doesn't handle namespaces at all, and makes a bunch of assumptions about how adaptors are shaped.

I generally want to use @openfn/describe-package to drive language analysis. Sadly describe-package, over in kit, also has a few problems.

[doc-han]

Resolved by #27