Split check ins midnight (EXPOSUREAPP-5706) (#2633)

* Create stub and test

* Prepare tests

* Update test data

* Mention test example reference

* Implement splitting

* Fix calculation

* Lint

* Specify Long values

* Split into smaller  functions

* Improve logging

* Refactor testing scenarios

* Refactor

* Kotlin style

* Add some edge cases

* Convert to extensions

* Use map

* Fix 2-days check-in less than a day duration case

* lint

* More test cases