WIP: feat: Improve batch performance

robert-server-batch/src/main/java/fr/gouv/stopc/robert/server/batch/component/ContactsProcessingCounter.java

+package fr.gouv.stopc.robert.server.batch.component;
+
+import lombok.Getter;
+
+public class ContactsProcessingCounter {
+
+	private static ContactsProcessingCounter instance;
+
+	@Getter
+	public int numberOfChunks = 0;
+
+	@Getter
+	public int numberOfProcessedContacts = 0;
+
+	private ContactsProcessingCounter() {
+
+	}
+
+	public static ContactsProcessingCounter getInstance() {
+
+		if (instance == null) {
+			instance = new ContactsProcessingCounter();
+		}
+
+		return instance;
+	}
+
+	public void increaseNumberOfChunks() {
+
+		this.numberOfChunks += 1;
+	}
+
+	public void increaseNumberOfProcessedContacts(int numberOfProcessedContacts) {
+
+		this.numberOfProcessedContacts += numberOfProcessedContacts;
+	}
+
+}