Add truth extensions for Measure, and add isNotWithin

[cuttestkittensrule]

• Add MeasureSubject
  • Operates on any WPILib Measure class, and can check if a value is what is expected, within a given degree of tolerance. This degree of tolerance is supplied as a Measure so it is clear what unit it is in.
  • When printing error messages, it shows the values in the units it was created in. This does mean that the different prints can all be different types.
• Add isNotWithin
  • Uses DoubleSubject's isNotWithin to assert that a value is not within a given tolerance of an expected value.
  • For non-measure subjects, they still exhibit the same behavior, interpreting the tolerance as the default unit (meters for distance, and radians for rotation).

[kcooney]

This looks great, but would be better with tests.

I sent out #152 which adds tests to the existing subjects

[kcooney]

I started adding tests for Pose2dSubject.isNotWithin() and, unfortunately, it doesn't work.

For example:

      @Override
      public void of(Pose2d expected) {
        translation().isNotWithin(tolerance).of(expected.getTranslation());
        rotation().isNotWithin(tolerance).of(expected.getRotation());
      }

If both the rotation and the translation are not within tolerance than this will not throw, but if only one of them is not within tolerance it will throw.

[kcooney]

@cuttestkittensrule I removed the broken isNotWithin() methods and added some tests for MeasureSubject.

Currently all of the tests use expected and actual values that have the same units. We should add tests for different units (ex: volts vs minivolts).