[java] Use units for more input parameters

[SamCarlberg]

While doing math with Java units can be a pain because of the lack of operator overloading, there are still many simple API methods that can have unit overloads to make configuration easier. Some good places that can be updated are:

• TimedRobot.addPeriodic and TimedRobot constructor - there can be overloads for Time and Frequency so users can use whatever units are most appropriate for their programs
• Timer.hasElapsed and Timer.delay
• BooleanEvent.debounce and the Debouncer constructors
• Watchdog.timeout and constructors
• Field2d.setRobotPose and FieldObject2d.setPose
• Notifier.startSingle and Notifier.startPeriodic (periodic can also use overloads for Time and Frequency)

[Murat65536]

Are these the only places you want updated or should everything that uses predesignated units be changed?

[SamCarlberg]

Most methods that could be safely overloaded with unit parameters would be fair game. For example, the TimedRobot constructor should have an overload for Time and another for Period

protected TimedRobot(double period) {
  ...
}

protected TimedRobot(Time period) {
  this(period.in(Seconds));
}

protected TimedRobot(Frequency frequency) {
  this(frequency.asPeriod());
}

If you're not sure, you can certainly start small and then update more areas after getting PR feedback