Add suggestion quick fixes

[fwcd]

E.g.

• Pointfree conversions
  • Eta-reductions (\x -> f x to f)
  • Const (\_ -> x to const x)
  • Void (x >> return () to void x)
  • ...
• Common library functions (maybe x id m to fromMaybe x m, fst . runState to evalState, snd . runState to execState, foldr1 (?) to anyOf, ...)
• Redundant dos (do { x } to x)
• Merging adjacent lets
• Warn (or at least 'info') about Debug.Trace imports
• ...

These suggestions could be similar to what hlint suggests.

[fwcd]

These suggestions could also be factored out into a separate linting tool that curry-language-server then integrated (i.e. depends on).