Add ability to set DiffUtil via Builder, add Adapter.submitList()

[P1NG2WIN]

PLEASE REVIEW AND TEST IT
PLEASE CHECK signingConfigs (RELEASE), I HAD PROBLEMS WITH IT SO COMMENTED IT.

Add ability to set diff util via Builder and later submitList to DiffUtil via new method Adapter.submitList()

[P1NG2WIN]

Also it would be cool if you will complete this pr by adding async list differ to your library

[manneohlund]

Hi and thanks for your PR @P1NG2WIN!
I'm in a major process of breaking out extensions such as listeners, diff util etc to separate modules and thus self containing extension libraries with their own artifact.
This is a good contribution and i will have a look and see how this will fit in with the new modularization.
Yes i'm aware of the signingConfig issue and will add a fix for that asap.
Stay tuned! 🚀

[manneohlund]

I'm closing this PR due to all issues has been addressed in latest v5.x.x releases. Thanks for contributing with issues and ideas!