Refactor vehicle functions to xLib.vehicle module

Moved all vehicle-related functions from es_extended/client/functions.lua to a new [core]/esx_lib/imports/vehicle/client.lua module under xLib.vehicle. Updated compat.lua to reference xLib.vehicle for vehicle operations, improving modularity and maintainability.

Author: SNAILX808

[core]/es_extended/client/compat.lua

@@ -26,3 +26,14 @@ end
 ESX.Game.GetClosestEntity = xLib.entity.closest
 EnumerateEntitiesWithinDistance = xLib.entity.EnumerateWithinDistance
 ESX.Game.Teleport = xLib.entity.Teleport
+
+ESX.Game.DeleteVehicle  = xLib.vehicle.Delete
+ESX.Game.SpawnVehicle = xLib.vehicle.Spawn
+ESX.Game.SpawnLocalVehicle = xLib.vehicle.Spawn(vehicle, coords, heading, cb, false)
+ESX.Game.IsVehicleEmpty = xLib.vehicle.IsEmpty
+ESX.Game.GetClosestVehicle = xLib.vehicle.Closest
+ESX.Game.GetVehiclesInArea = xLib.vehicle.EnumerateWithinDistance
+ESX.Game.IsSpawnPointClear = xLib.vehicle.IsSpawnPointClear
+ESX.Game.GetVehicleInDirection = xLib.vehicle.GetInDirection
+ESX.Game.GetVehicleProperties = xLib.vehicle.GetProperties
+ESX.Game.SetVehicleProperties = xLib.vehicle.SetProperties