Implement Retry into Queue Lib

[PineappleIOnic]

This PR implements Retry functionality into the Queue library, it will take all failed jobs in {namespace}.failed.{queue} and re-queue them while removing them from that list.

[TorstenDittmann]

How is the retry strategy applied in production?

As far as I can see here right now, is that we manually need to retry and it just works of all failed jobs. I am not sure if this is the most sane approach. Usually with all common libraries, the retry configuration is tied to a job. Meaning you enqueue a job while defining how its going to be retried.

I am not sure if blindly just working of failed jobs is good. We dont know how many times a job has been retried, etc.

ref:

• https://docs.bullmq.io/guide/retrying-failing-jobs
• https://medium.com/insiderengineering/optimize-your-laravel-applications-performance-effective-strategies-for-implementing-job-retries-384da22e3a50

[PineappleIOnic]

Right, I'll try and so some research and think of something better

[eldadfux]

Where is the sum method I saw in the Appwrite PR? I can't seem to find it.

Changes addressed