feat(typegen): Go Type Gen

[isaacharrisholt]

What kind of change does this PR introduce?

Feature

What is the current behaviour?

No Go types

What is the new behaviour?

This PR adds type generation for Go based on the proposal in this discussion.

There's also some cleanup in server.ts for local development, which a) crosses off a TODO comment and b) makes it simpler to extend with new type generators later.

Additional context

This PR requires #685 to be merged first and currently contains the changes from that PR. If you're interested in the changes made by this one, I recommend looking at commits b24e63d onwards, which mostly touch these files:

• */go.ts
• server.ts
• routes.ts
• package.json

Still TODO:

• [x] Handle composite types
• [x] Handle range types
• [x] Tests

Let me know your feedback or if you'd like any changes :)

[isaacharrisholt]

Going to mark this as draft for now - I've decided it might be better to separate out the Select, Insert and Update models (as in JS) and make use of the sql.Null* types in the standard library

[isaacharrisholt]

I've now done the above, so this should be ready to go