feat: Allow retrying completed jobs when using BullMQ

[dumbasPL]

This PR adds support for retrying completed jobs when using the BullMQ adapter. Retrying completed jobs is not possible in bull, only in BullMq.

closes #506

[felixmosh]

Hi @dumbasPL
Can we make it possible to fake retries of completed jobs for bull as well?

[dumbasPL]

Changes implemented, please review.

Hi @dumbasPL Can we make it possible to fake retries of completed jobs for bull as well?

Do we want to do that? So far this project wasn't trying to do things that aren't already natively supported. Doing this without making it obvious to the user what's actually going to happen might introduce unnecessary confusion and a lot of potential bugs.

How would we even go about doing this? When retrying jobs stuff like the job id remains constant. How about user-defined job IDs? Should we remove the job before adding a new one? How about repeated jobs? How about the attempts counter?

Personally, I think this is a terrible idea. A lot of ambiguity and unexpected behavior.

[felixmosh]

Thank you for this PR

[felixmosh]

Released in v4.10.0