[13.0][ADD] queue_job: db listener

[nilshamerlinck]

The goal of this PR is to introduce an opt-in mechanism to enable the jobrunner to take into account changes happening after server launch.

For now, it is focused on databases:

• addition (installation of the module on a new or existing database)
• removal (uninstallation of the module from a database).

Beyond the post_init/uninstall hooks, an http route is added to enable admins to manually trigger addition/removal events for a given database.

[OCA-git-bot]

Hi @guewen,
some modules you are maintaining are being modified, check this out!

[guewen]

Very interesting implementation!
Could you test it for some time already?
I like the fact that it has to be activated explicitly, although it would be worth mentioning it in readme/CONFIGURATION.rst

BTW, you may be interested in #256 too :)

[nilshamerlinck]

Hi,

Yes, we've been using it in production for some time already.

Is it ok if I favor documentation through readme/ files and remove some of the redundant module docstrings?

[github-actions]

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