[telemetry] Add equivalent for Java `UnitTelemetry` helper function

Python doesn't have a units library like C++ or Java does, but it could at least have a utility function for the Telemetry API to log a value with an associated unit string, which is also supported in Java:
https://github.com/wpilibsuite/allwpilib/blob/d1944ddec0cb737852e9820dd83a982fd45a1029/wpilibj/src/main/java/org/wpilib/internal/UnitTelemetry.java#L95-L106

Start by locating the Python Telemetry API and compare its available logging helpers with the linked Java UnitTelemetry implementation. Add the equivalent utility for logging a value with an associated unit string, then verify that it is exposed through the expected Telemetry interface and covered by the repository's existing tests.

Written by the indexing model from the issue text.