Add flight model classes with enums and relationships

- Added `Flight`, `FlightType`, `FlightPublicData`, `FlightScoringData` classes for representing flight details.
- Introduced `Daytime` enum for specifying flight time periods.
- Established relationships between flight-related classes for improved data organization.

src/main/java/dev/coph/flightscore/backend/flight/Daytime.java

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+package dev.coph.flightscore.backend.flight;
+
+public enum Daytime {
+    MORNING,
+    EVENING,
+
+}

src/main/java/dev/coph/flightscore/backend/flight/Flight.java

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+package dev.coph.flightscore.backend.flight;
+
+import lombok.Getter;
+import lombok.experimental.Accessors;
+
+import java.time.LocalDate;
+
+@Getter
+@Accessors(fluent = true)
+public class Flight {
+
+    private int flightNumber;
+    private FlightType type;
+    private LocalDate date;
+    private Daytime daytime;
+    private int qnh;
+    
+    private FlightPublicData publicData;
+    private FlightScoringData scoringData;
+
+
+}

src/main/java/dev/coph/flightscore/backend/flight/FlightPublicData.java

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+package dev.coph.flightscore.backend.flight;
+
+import lombok.Getter;
+import lombok.experimental.Accessors;
+
+/**
+ * A class for the public data of a flight. Not used for scoring
+ */
+@Getter
+@Accessors(fluent = true)
+public class FlightPublicData {
+
+    private String launchArea;
+    private String launchPeriod;
+    private String MinimumILPToGoals;
+    private Boolean soloFlightRequired;
+    private String SunsetAndSunrise;
+    private String PZsInForce;
+    private String searchPeriod;
+    private String nextBriefing;
+    private String additionalNotes;
+
+}

src/main/java/dev/coph/flightscore/backend/flight/FlightScoringData.java

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+package dev.coph.flightscore.backend.flight;
+
+import lombok.Getter;
+import lombok.experimental.Accessors;
+
+import java.time.Instant;
+
+@Getter
+@Accessors(fluent = true)
+public class FlightScoringData {
+
+    private Instant launchPeriodStart;
+    private Instant launchPeriodEnd;
+    private Integer minimumILPToGoalsInMeter;
+    
+}

src/main/java/dev/coph/flightscore/backend/flight/FlightType.java

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+package dev.coph.flightscore.backend.flight;
+
+public enum FlightType {
+    COMPETITION,
+    PRACTICE
+
+
+}