fix(helpers): JSON helpers' return types incorrectly have `Date`s and other JS/Node-native instances that require data type metadata.

[igalklebanov]

Hey :wave:

closes #482.

We're going for a shallow approach - no recursion:

1. Recursion would be very expensive at compile time.

2. JSON results of nested JSON helpers should already be covered by their return type calculation.

3. If you have JSON columns, you should have already defined them properly - no JS/Node native, JSON invalid, types in their SelectType.

4. PostgreSQL arrays are in the scope of this change. e.g. a timestamp[] column would be string[], not Date[].

Typings test seems to be running for same amount of time. 😬

Will add some more cases tomorrow.

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