fix(mock): quantize the wrapping fuel counter

[Tanchouteur]

This pull request improves the handling of the 8-bit fuel counter in the TripStatsService to ensure more accurate and robust fuel consumption calculations, especially in the presence of counter wraps and floating-point imprecision. The main changes include introducing a quantized tick-based delta computation, refactoring the main loop to use this logic, and adding targeted unit tests to validate the new behavior.

Fuel counter logic improvements:

• Added _fuel_counter_steps and _fuel_counter_step_l to the constructor to represent the number of counter steps and the fuel value per step, enabling quantized tick-based calculations.
• Introduced the _fuel_counter_delta method, which accurately computes the fuel delta by quantizing raw float values to counter ticks, properly handling counter wraps, and filtering out implausible jumps.
• Refactored the main loop in _run to use _fuel_counter_delta instead of the previous float-based delta calculation, improving reliability and code clarity.

Testing enhancements:

• Added unit tests to ensure that equivalent float values do not trigger false wraps, real counter wraps are handled correctly, and implausible jumps are still rejected, increasing confidence in the new logic.

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