`JsonInclude.Include.NON_EMPTY` affects dirty check

[firedes]

JsonInclude.Include.NON_EMPTY affects dirty check, even json mapping properties override equals and hashCode correctly.
Don't know why, didn't find any description about this in hypersistence-utils documents.

[vladmihalcea]

Try to create a replicating test case that proves the problem.

There are many tests asserting the number of statements that are executed, so you can use that mechanism to demonstrate how the dirty checking mechanism is affected.

[firedes]

@vladmihalcea Added a pr #591

[vladmihalcea]

Great. Now, the next step is to debug the library and see why it doesn't work. Let me know what you have found out so that we can see what's the best way to address the problem.