Code actions for ignoring hlint hints

[michaelpj]

It would be nice to have a code action to ignore a particular hlint hint from the editor.

The main complexity is that hlint's support for ignoring things is quite complex and there are multiple things that could be done:

• Changes can be made either to:
  • The source file (add ANN/HLINT pragmas)
  • The .hlint.yaml (ignore files or hints)
• The scope of the ignore could be different
  • When adding an annotation, you can target a specific definition or the entire module
  • When editing .hlint.yaml, you can also disable the hint entirely

Maybe we just need to provide a few code actions with a selection of these options, or make it configurable somehow. Anything that involves editing the .hlint.yaml file probably also requires #594.

[jneira]

#600

[michaelpj]

Yep, that's better, and has more discussion.