Implement a specific comparison function for dates

Dates with milliseconds precision, but with millisecond value set to 0 (e.g., 2022-04-02T18:52:00.000Z) can be rendered as 2022-04-02T18:52:00.000Z or 2022-04-02T18:52:00Z. Both are correct and should be accepted when testing responses payloads.

As DeepDiff is already used in the test suite, a custom operator as described in https://zepworks.com/deepdiff/current/custom.html may be a good fit.