relude-0.5.0: Custom prelude from Kowainik

Goals

• Avoid all partial functions (like head :: [a] -> a). The types of partial functions lie about their behavior and usage of such functions can lead to the unexpected bugs. Though you can still use some unsafe functions from Relude.Unsafe module, but they are not exported by default.
• Type-safety. We like to make invalid states unrepresantable. And if it's possible to express this concept through the types then we will do it. Example: whenNotNull :: Applicative f => [a] -> (NonEmpty a -> f ()) -> f ()
• Performance. Prefer Text over String, use spaceleak-free functions (like our custom sum and product).
• Minimalism (low number of dependencies). We don't force users of relude to stick to some specific lens or text formatting or logging library.
• Convenience (like lifted to MonadIO functions, more reexports). But we want to bring common types and functions (like containers and bytestrng) into scope because they are used in almost every application anyways.
• Provide excellent documentation.

1. Tutorial
2. Migration guide from Prelude
3. Haddock with examples for (almost) every function (all examples are tested with `doctest`)
4. Documentation regarding internal module structure)
5. relude-specific HLint rules: .hlint.yaml

• User-friendliness. Ability to quickly migrate to relude if you're familiar with the common libraries like text and containers.
• Exploration. Experiment with new ideas and proposals without introducing breaking changes.