Add hnix-store-pretty

[sorki]

Using prettyprinter library

• covering types from hnix-store-core
  • colorful output for nix-derivations Derivation using https://hackage.haskell.org/package/prettyprinter-ansi-terminal
• covering some types from hnix-store-remote (when they settle down)

[sorki]

Prettyprinter for -remotes Logger is badly needed as the output is barely decipherable. The Logger type is most probably finished for now.