Add units for native falcon tic amounts

[Liam-Stow]

The Falcon 500s use weird units that are hard to work with: encoder tics for position and encoder tics per 100ms for velocity.
Let's add new unit types for these so we can implicitly convert to and from nice units like meters, degrees and meters per second.
Use https://github.com/nholthaus/units#unit-definition-macros
Note that units will need to be mechanism specific. for example, a Drive Base speed unit type using the falcons will need to take into account the gear ratio and wheel size:

metersPerSecToWheelRotationsPerSec = 1/WHEEL_CIRCUMFERENCE
metersPerSecToMotorRotationsPerSec = metersPerSecToWheelRotationsPerSec / GEAR_RATIO
metersPerSecToFalconTicsPerSec = metersPerSecToMotorRotationsPerSec * FALCON_TICS_PER_ROTATION
metersPerSecToFalconTicsPerMillisec = metersPerSecToFalconTicsPerSec / 1000
metersPerSecToFalconTicsPer100Milliseconds = metersPerSecToFalconTicsPerMillisec * 100

UNIT_ADD(length, falconSwerveSpeed, unit<std::ratio<1, metersPerSecToFalconTicsPer100Milliseconds>, meters_per_second>)