feat(Endpoint): Send OBD2 data via MAM

[splasky]

The OBD2 dataset fetch from the OBD2 monitor would send OBD2 data via the endpoint core. The data format show as the following:

// json format
{ 
"timestamp": 1600756069,
"device_id": "AAAAAAAAAAAAAAAA",
"data" : { 
        "vin": (uint32_t),
        "engine_load": (uint32_t),
        "engine_coolant_temperature": (uint32_t),
        "fuel_pressure": (uint32_t),
        "engine_speed": (uint32_t),
        "vehicle_speed": (uint32_t),
        "intake_air_temperature": (uint32_t),
        "mass_air_flow": (uint32_t),
        "fuel_tank_level_input": (uint32_t),
        "absolute_barometric_pressure": (uint32_t),
        "control_module_voltage": (uint32_t),
        "throttle_position": (uint32_t),
        "ambient_air_temperature": (uint32_t),
        "relative_accelerator_pedal_position": (uint32_t),
        "engine_oil_temperature": (uint32_t),
        "engine_fuel_rate": (uint32_t),
        "service_distance": (uint32_t),
        "anti_lock_barking_active": (uint32_t),
        "steering_wheel_angle": (uint32_t),
        "position_of_doors": (uint32_t),
        "right_left_turn_signal_light": (uint32_t),
        "alternate_beam_head_light": (uint32_t),
        "high_beam_head_light": (uint32_t),
 }
}

[splasky]

Block by #694, #759.

[splasky]

Close by #775