EventFacet class must be replaced by EventRecordFacet class

[fabrizio-turchi]

The below example contains only the main properties. Other additional properties are:

• observable:eventRecordServiceName. The service that generated the event record. A single application can have multiple services generating event records.
• observable:eventRecordDevice The device on which the log entry was generated. It's an @id reference to an observable_Device
• observable:application. The app generating the event, it's an @id reference to an observableApplicationFacet
• observable:startTime and observable:endTime
• Example:

{
            "@id": "kb:fe688202-4b21-48d2-b07d-170e14971935",
            "@type": "uco-observable:ObservableObject",
            "uco-core:hasFacet": [
                {
                    "@id": "kb:a45c81a7-9afc-482d-9d37-a2b55ddb570d",
                    "@type": "uco-observable:EventRecordFacet",
                    "uco-observable:eventType": "PowerEvent",
                    "uco-observable:eventRecordText": "Power on",
                    "uco-observable:observableCreatedTime": {
                        "@type": "xsd:dateTime",
                        "@value": "2021-05-18T11:31:46+00:00"
                    }
                }
            ]
        }