show original and new values

[gnairooze]

Add new feature to show original and new values in changed simple properties.
Enhance the boolean showOriginalValue to be an enum to have a new option to show both original and new values.

[roman-temekunidi]

I agree with @gnairooze idea.
In my use case, I use the differ to assert the equality of objects in unit tests. I create a test and then run it continuously while developing a feature. It is very helpful to see both the expected and actual values to spot the issue in the feature code faster.