Implement Vehicle Location Streaming with MQTT and SSE.

[muhammadzkralla]

This pull request introduces real-time vehicle location streaming for trips using Server-Sent Events (SSE) and MQTT integration. The main changes include a new DTO for streaming vehicle location, updates to the MQTT service to handle streaming messages, and new methods in the trip service to manage SSE emitters and broadcast location updates to clients.

Vehicle Location Streaming Feature:

• Added a new SSE endpoint (/api/trips/{tripId}/location/stream) in TripController to allow clients to subscribe to real-time vehicle location updates for a trip.
• Introduced VehicleStreamLocationDto to encapsulate vehicle location data sent via MQTT.
• Updated MqttService to handle topic/trip/stream_location messages, parse the payload, and trigger location broadcasts. [1] [2] [3]
• Added methods in TripService and TripServiceImpl to manage SSE emitters (subscribeToLocationStream) and broadcast location updates to subscribed clients (broadcastLocationStream). [1] [2]

Configuration Updates:

• Registered the new MQTT topic topic/trip/stream_location in both application-docker.yml and application-test.yml to ensure the service subscribes to location stream messages. [1] [2]

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