Make Worker Timeout Configurable

[evilsidekick293]

see #1469

This is especially interesting for the combination of a large file and a weak hardware setup.

[nbently]

Thanks for digging into this, really helped me & my weak hardware 😁. Django Q doesn't like it when the timeout value is set higher than the retry value.

/usr/local/lib/python3.9/site-packages/django_q/conf.py:139: UserWarning: Retry and timeout are misconfigured. Set retry larger than timeout, 
        failure to do so will cause the tasks to be retriggered before completion. 
        See https://django-q.readthedocs.io/en/latest/configure.html#retry for details.

Might want to just amend the PR so the PAPERLESS_WORKER_TIMEOUT value sets both the retry & timeout values in the q cluster (which is what I did in my fork).