feat: add support for json and jsonb fields

[adriand]

This pull request adds support for json and jsonb fields, converting them to Record<string, any> in the Typescript types.

This might be worth a discussion, since Typescript conventions would dictate that a more appropriate type is Record<string, unknown>, given that any is seen as a code smell. However, making it Record<string, unknown> would have the effect of forcing you to override the library's type conversion, by either specifying Record<string, any> or by writing a more comprehensive type, which defeats the purpose of automatic conversion.

A stronger alternative would be something like JSONObject:

type JSONValue = 
  | string
  | number
  | boolean
  | null
  | JSONValue[]
  | { [key: string]: JSONValue };

type JSONObject = { [key: string]: JSONValue };

But that seems like a fairly large departure from the current approach of fairly straightforward type conversion.

[ElMassimo]

Hi Adrian!

Typescript conventions would dictate that a more appropriate type is Record<string, unknown>

Agreed, but given the library allows you to specify a more strict type (or even, create another serializer for that JSONB structure), I'm fully on board with the option you chose.

Thanks!