Filter influx import types, add calculated speed and distance to BikeSpeedData

[tuna-f1sh]

InfluxDB doesn't support list etc. so filter fields to int or float.

The BikeSpeedData isn't very useful as import so add calculated_speed and calculated_distance. These are cached values that when calculate_speed and calculate_distance are called, will be saved.

update_speed_data will do this if a wheel_circumference_m is passed. The ANT+ devices which use this dataclass have a optional wheel_circumference_m added to do this - one must initiate with this keyword arg to do this.

Closes #117