Enable quality check plugins with functions

[alextu]

This avoids applying the plugin(s) if not explicitly required by exposing functions instead of boolean flags.
See original discussion #220 (comment)

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[sghill]

Thanks @alextu! This was released as 0.48.0-rc.3 if you'd like to test it out. I usually run with the candidate for about a week and promote to release if there are no issues.

[sghill]

0.48.0 was released today with this change