Transformer API

[psteinroe]

Is your feature request related to a problem? Please describe.
In some cases, you might want to transform the data from PostgREST after fetching it, e.g. create a js Date for timestamptz columns, or convert the snake case to camel case (#244)

Describe the solution you'd like
Add a transformer API to all query hooks, that accepts a transformer: (result: R) => TransformedResult method. The transformer is applied within the fetcher, and before the data is written to the cache. It also transforms the Result type to ensure type-safety.

Describe alternatives you've considered
Wrapping the hooks and transform them afterwards.

[github-actions]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 5 days.

[github-actions]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 5 days.

[baba43]

This is one of the first features that I was looking for. Simple use case: parse Dates.