Fixable checks

[JamesHemery]

Rework of #1 initiated by @indykoning

Introduce new configuration variables :

• preset (by @indykoning) : Define the Pint preset to use
• ignore_patterns (by @indykoning) : Add ignore patterns to exclude some files from the GrumPHP context
• auto_fix
• auto_stage

Auto fix

When auto_fix is not enabled, GrumPHP runs Pint in dry mode and then asks if you want to apply patches automatically.

By default, auto_fix is enabled only in a pre_commit context.

Possible values are true, false, pre_commit, run.

Auto stage

Allows you to automatically stage (git add) files affected by Pint with GrumPHP.

By default, auto_stage is enabled only in a pre_commit context.

This option only works when auto_fix is enabled for the runtime context.