Add a new schema that allows ingestion of ECS logs to the Event Platform
We wish to start generating ECS compatible logs that can be ingested both into Logstash and also into the Data Lake.
This commit adds an ECS primary schema to enable this.
Be aware that ECS events use @timestamp for the primary time field, whereas this violates the naming convention for Event Platform schemas since it contains an @ symbol.
When ingesting this type of event into logstash, we will need to map dt to @timestamp.