refact(ops/stream_events): directly construct json value

[Profpatsch]

Instead of having complex generic types internally that we map over, just create the json in a macro.

Removes ProjectAdded from Reason, because it was not used anywhere. Changes the daemon format, so make sure to run the daemon with this new lorri version or you get serialization errors.

• [ ] Amended the changelog in release.nix (see release.nix for instructions)

[Profpatsch]

@nyarly you are using stream_events right? Do you wanna try this out, in case I added a typo somewhere?