Inconsistency in naming schemas

[viktorbeck98]

Some variables are not consistently named like "EventId"/"event_id"/"EventID".

Also, the some of the protobuf schema names like "alertsObtain" are unintuitive. We should agree on a unified terminology.

It would be good to have a single source of truth which is why i created src/detectmatelibrary/constants.py some time ago.