Custom Prelude with cross-GHC re-exports

[Kleidukos]

We're starting to have a significant (and ever-growing) amount of CPP for exports.

I'd like to suggest using a custom prelude file that re-exports Prelude before base 4.18 and the things that base 4.18 re-exports like liftA2.
What do you think @jonascarpay? :)

[jonascarpay]

Oh, that's a good idea. The more we isolate and organize the CPP stuff the better imo.

[jonascarpay]

Do you think this is worth doing before cutting a GHC 9.6-compatible release?

[Kleidukos]

That can be done in a timely fashion yes 👍