Add support for DateTime comparison with TimeSpan tolerance

[RenderMichael]

Fixes #4600

[RenderMichael]

I had to pull out the test data into a source method because DateTime/TimeSpan are not allowed in attributes.

Also, unlike the existing double and ints being tested, DateTime's formatting in the error messages is different from the normal ToString(), so I called MsgUtils.FormatValue directly like the exception message formatting itself does.

[manfred-brands]

Thanks @RenderMichael.

The code changes are nice and simple.

However as it also affects other areas where Tolerance is used, could you also please update the other constraint tests: GreaterThanOrEqualConstraintTests, LessThanConstraintTests and LessThanOrEqualConstraintTests by adding use cases for TimeSpan.

[RenderMichael]

Thanks for the feedback @manfred-brands

The PR has been updated, I also added an equality test to the existing Greater Than tests.

[manfred-brands]

Thanks again @RenderMichael for adding those extra tests.

Nothing more from me.

[RenderMichael]

Sorry for the update after the fact, I noticed I used some terrible variable names in the tolerance method. Fixed with no functional changes

[stevenaw]

Thanks for the contribution @RenderMichael ! Appreciate the final cleanup you did too :)

[stevenaw]

I'm going to try converting this to a draft and back to see if it un-sticks the WIP check

[stevenaw]

@OsirisTerje The WIP check seems stuck here and I don't seem to be able to override the merge. Are you able to help?

[OsirisTerje]

@stevenaw Merged.

[stevenaw]

Thanks @OsirisTerje