feat: implemented date filtration and a utils service to prevent code ducplication

MyINPulse-back/src/main/java/enseirb/myinpulse/model/DelAppointment.java

@@ -1,8 +0,0 @@
-package enseirb.myinpulse.model;
-
-public class DelAppointment {
-    int validated;
-    int[] akserId;
-    int[] destId;
-    String date; // TODO: date type ?
-}

MyINPulse-back/src/main/java/enseirb/myinpulse/model/DelProject.java

@@ -1,7 +0,0 @@
-package enseirb.myinpulse.model;
-
-public class DelProject {
-    int projectId;
-    String projectName;
-    String projectDescription;
-}

MyINPulse-back/src/main/java/enseirb/myinpulse/model/DelReport.java

@@ -1,6 +0,0 @@
-package enseirb.myinpulse.model;
-
-public class DelReport {
-    int projectId;
-    String reportContent;
-}

MyINPulse-back/src/main/java/enseirb/myinpulse/model/LCSection.java

@@ -1,7 +0,0 @@
-package enseirb.myinpulse.model;
-
-// TODO: is this redundant with the Section class from the database ?
-// TODO: In the one hand it represent the same data, and on the other it should be much lighter.
-// TODO: btw why does a LC section have an administrator ?
-
-public class LCSection {}