Convert all procedural hook implementations to Hook classes

We have another issue open that overlaps/relates to this: 📌 Replace farmOS hooks with Events + EventSubscribers Active

I think we can work on this issue as the first priority, since we should follow core's pattern first and foremost.

IIRC the other issue proposes some other changes, so let's review that again and see if/how it needs to be updated

I wonder if we should consider deprecating the Asset/Log/Plan/etc events, and just recommend using the core hooks as intended.

There is a draft PR for a Rector rule that automates this conversion here: https://github.com/palantirnet/drupal-rector/pull/308