Rename top-level modules/design a public interface

[WhatisRT]

The Prelude module is quite useful, but it's really an internal module and we shouldn't prevent anyone from having their own module named Prelude. How about renaming it something like StdlibMeta.Prelude?

Variations of the same issue apply to Main and Meta. Main is mostly for CI/documentation purposes and I'm not sure we should even have it as a real part of the library. More generally, we should have a reasonable public interface that doesn't take module names that people may want to use.

[omelkonian]

Completely agree.