Add AltitudeSource enum and task model, update Competition with altitude source field

- Introduced `AltitudeSource` enum to specify altitude data sources (GPS, Barometric).
- Added `Task` class with task number field and fluent accessor annotations using Lombok.
- Updated `Competition` class to include the `altitudeSource` field.

src/main/java/dev/coph/flightscore/backend/competition/AltitudeSource.java

@@ -0,0 +1,6 @@
+package dev.coph.flightscore.backend.competition;
+
+public enum AltitudeSource {
+    GPS,
+    BAROMETRIC
+}

src/main/java/dev/coph/flightscore/backend/competition/Competition.java

@@ -25,6 +25,7 @@ public class Competition {
     private Locale country;
     private String location;
     private String website;
+    private AltitudeSource altitudeSource;
     private HashMap<String, Coordinate> commonLaunchPoints;
     private HashSet<CompetitionContact> contacts;
 

src/main/java/dev/coph/flightscore/backend/task/Task.java

@@ -0,0 +1,11 @@
+package dev.coph.flightscore.backend.task;
+
+import lombok.Getter;
+import lombok.experimental.Accessors;
+
+@Getter
+@Accessors(fluent = true)
+public class Task {
+    private int taskNumber;
+
+}