Allow to specify rule type

[audriusnavickasDB]

Hello. I believe I have a feature request as I couldn't any information regarding this.

My team would like to have an ability to set how specific rules should be treated. For example: we have a certain rule which is always treated as a warning by pa11y. However we would like to treat that rule as an error all the time.

Maybe it would be possible to allow this functionality via rules or something? For example:
rules: [{name: 'Principle.1_1_1', type: 'error' }]

Awesome work and thank you for response in advance!