Filter and pagination for search

[f-odhiambo]

This is a subtask of #50

[rkodev]

We can adapt the Jetpack paging library for this issue to create a continuous scrollable list that takes advantage of Room LiveData observables or use the old pagination technique of manually scrolling to the next page.

NB currently the SDC does not support directly observing Live Data on a Room database but it should be possible to implement this functionality using a custom data source

[vincent-karuri]

@rkodev I don't know if the infinitely scrollable view is the most UX-friendly. The current mock-ups use the pagination style where we have a fixed number of patients per page.

I think a hybrid would be to support getting a specific number of entries per query to the DB and using the results to populate each page. Thoughts?

[rkodev]

@vincent-karuri Yes, we have defaulted to adding the default patient pagination with a next and previous button at the bottom of the page

[f-odhiambo]

There is an implementation of this on worth check-in out google/android-fhir#497 cc @vincent-karuri @rkodev