feat(school): create Interface CalendarEvent and different variant fo…

…r date, interval and lesson

schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/CalendarEvent.kt

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+package com.intelligentbackpack.schooldomain.entities.calendar
+
+import java.time.LocalTime
+
+/**
+ * An event in the calendar.
+ *
+ * @property startTime the time the event starts
+ * @property endTime the time the event ends
+ */
+interface CalendarEvent {
+    val startTime: LocalTime
+    val endTime: LocalTime
+}

schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/DateEvent.kt

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+package com.intelligentbackpack.schooldomain.entities.calendar
+
+import java.time.LocalDate
+
+/**
+ * An event that happens on a specific date.
+ *
+ * @property date the date of the event
+ */
+interface DateEvent : CalendarEvent {
+    val date: LocalDate
+}

schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/DateLesson.kt

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+package com.intelligentbackpack.schooldomain.entities.calendar
+
+/**
+ * Represents a lesson that occurs on a specific date.
+ *
+ * @property date the date of the lesson
+ */
+interface DateLesson : Lesson, DateEvent

schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/Lesson.kt

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+package com.intelligentbackpack.schooldomain.entities.calendar
+
+import com.intelligentbackpack.schooldomain.entities.Class
+import com.intelligentbackpack.schooldomain.entities.Subject
+import com.intelligentbackpack.schooldomain.entities.person.Professor
+
+/**
+ * A lesson.
+ *
+ * @property subject the subject of the lesson
+ * @property module the module of the lesson
+ * @property professor the professor of the lesson
+ * @property studentsClass the class of the lesson
+ */
+interface Lesson : CalendarEvent {
+    val subject: Subject
+    val module: String?
+    val professor: Professor
+    val studentsClass: Class
+}

schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/WeekEvent.kt

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+package com.intelligentbackpack.schooldomain.entities.calendar
+
+import java.time.DayOfWeek
+import java.time.LocalDate
+
+/**
+ * An event that happens every week at the same time on the same day of the week for a certain period of time.
+ *
+ * @property day the day of the week the event happens
+ * @property fromDate the date from which the event happens
+ * @property toDate the date until which the event happens
+ */
+interface WeekEvent : CalendarEvent {
+    val day: DayOfWeek
+    val fromDate: LocalDate
+    val toDate: LocalDate
+}

schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/WeekLesson.kt

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+package com.intelligentbackpack.schooldomain.entities.calendar
+
+/**
+ * A lesson that happens every week at the same time on the same day.
+ */
+interface WeekLesson : Lesson, WeekEvent