Added utility to write time logs during the deduplication phase

dhp-common/src/main/scala/eu/dnetlib/dhp/application/dedup/log/DedupLogModel.scala

@@ -0,0 +1,3 @@
+package eu.dnetlib.dhp.application.dedup.log
+
+case class DedupLogModel(tag:String, configuration:String, entity:String, startTS:Long, endTS:Long, totalMs:Long ) {}

dhp-common/src/main/scala/eu/dnetlib/dhp/application/dedup/log/DedupLogWriter.scala

@@ -0,0 +1,16 @@
+package eu.dnetlib.dhp.application.dedup.log
+
+import org.apache.spark.sql.{SaveMode, SparkSession}
+
+class DedupLogWriter (path:String) {
+
+
+  def appendLog(dedupLogModel: DedupLogModel, spark:SparkSession): Unit = {
+    import spark.implicits._
+    val df  = spark.createDataset[DedupLogModel](data = List(dedupLogModel))
+    df.write.mode(SaveMode.Append).save(path)
+
+
+  }
+
+}