Merge worker inside api

[jooola]

To go one step closer to the new architecture design, we need to merge the celery worker inside the API.

This should happen for 3.1.x or 4.0.0 depending if we find a way that doesn't break anything. I think this should be doable for 3.1.x, but might require some user intervention for some cleanup (clean old libretime-celery package and service).

Here is a roadmap that describe how we can accomplish that.

• Move the celery worker inside the django api
• Rewrite the podcast download task to use the django ORM
  • download and save data directly to the DB
• Rewrite how legacy starts a podcast download task
  • by sending a message to the worker without the jooola/celery-php library
• Rewrite how legacy awaits the result of the podcasts download
  • query the DB until the new data landed ?
• Remove the jooola/celery-php library from legacy
• Upgrade celery to v5 (was blocked by the jooola/celery-php library)

This should unlock some issues / pull requests:

• Celery v5 not starting #1084
• Merge worker service and analyzer service together #1503
• chore(deps): update dependency celery to v5 [security] #1800
• chore(deps): update dependency kombu to v5 #1812

[github-actions]

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