Provide an exception interface all exceptions implement

Makes total sense to me, we have added a lot of exceptions since we started.

I'll set this to 1.2.x, since I can't see any reasons that this would be a breaking change?

I think we should add a follow up issue as well after that, to write documentation about the exceptions and document when to extend the marker interface or use the exceptions as a third party module.

@marcus_johansson,

Should the interface be named `AiExceptionInterface` ?

I'll set this to 1.2.x, since I can't see any reasons that this would be a breaking change?

Yeah nothing should break. The interface isn't adding methods at all.

@d34dman - It would need the suffix for the tests to pass, so if nothing else for that reason we should change the name.

10 | WARNING | Interface names should always have the suffix "Interface"
    |         | (Drupal.Classes.InterfaceName.InterfaceSuffix)

Didn't read phpcs fail, turns out coding standards dictated the answer.

Looks like tests are failing on changes un-related to this MR, so requesting a review.

Looks good to me!

Thanks all, getting merged.