Remove metadata method from DeviceMeasurementBuilder

The metadata method that was responsible for setting the metadata fields in the DeviceMeasurementBuilder has been removed. This code change simplifies the DeviceMeasurementBuilder and removes potential redundancy as the metadata is currently not required in our use case.

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>de.app.5gla</groupId>
     <artifactId>fiware-integration-layer</artifactId>
-    <version>9.0.0</version>
+    <version>9.1.0</version>
 
     <name>5gLa FIWARE integration layer</name>
     <url>https://github.com/vitrum-connect/5gla-fiware-integration-layer</url>