refactor: Add FlightSchedule.Index field and update parsers

The code changes introduce a new `Index` field in the `FlightSchedule` struct and update the parsers in `aviation_parser.go` and `schedule_parser.go` to handle this field. This addition allows for the extraction and parsing of the `Index` value from flight schedule messages. The changes improve the functionality and accuracy of the code when working with flight schedules.

internal/parsers/schedule_parser_test.go

@@ -23,4 +23,25 @@ var _ = Describe("Schedule Parser", func() {
 			Expect(waypoints).To(BeNil())
 		})
 	})
+
+	Describe("Parsing one line of schedule", func() {
+		Context("parse : W/Z FM9134 B2688 1/1ILS (00) TSN0100 SHA", func() {
+			lineText := "W/Z FM9134 B2688 1/1ILS (00) TSN0100 SHA"
+			schedule := ParseLine(lineText)
+			It("should return a valid schedule", func() {
+				Expect(schedule).NotTo(BeNil())
+				Expect(schedule.Task).To(Equal("W/Z"))
+				// Expect(schedule.Date).To(Equal("TSN0100"))
+				// Expect(schedule.Task).To(Equal("1/1"))
+				Expect(schedule.FlightNumber).To(Equal("FM9134"))
+				Expect(schedule.AircraftReg).To(Equal("B2688"))
+				// Expect(schedule.PassengerConfig).To(Equal("1/1"))
+				// Expect(schedule.ILS).To(Equal("ILS (00)"))
+				// Expect(schedule.DepartureAirport).To(Equal("TSN"))
+				// Expect(schedule.DepartureTime).To(Equal("0100"))
+				// Expect(schedule.ScheduleInfo).To(Equal("SHA"))
+			})
+
+		})
+	})
 })