Splitting the queryTypes object into individual imports

[franky47]

One issue with the current way of importing query type parsers/serializers is that they all live in one big object:

import { useQueryState, queryTypes } from 'next-usequerystate'

useQueryState('foo', queryTypes.integer)
useQueryState('bar', queryTypes.boolean)

This prevents tree-shaking and increases bundle size unnecessarily.

The following could be done instead:

import { useQueryState, parseAsInteger, parseAsBoolean } from 'next-usequerystate'

useQueryState('foo', parseAsInteger)
useQueryState('bar', parseAsBoolean)

This change can be done in a non-breaking manner, by exporting individual parsers but building the bag of parsers from those exports for compatibility.

My question to y'all is about naming those individual exports:

[franky47]

Using parseAsXyz.