Modernize legacy RecyclerView adapters (#694)

* Modernize legacy RecyclerView adapters

Introduces new adapters based on the SearchableRepositoryViewModel and
using androidx.recyclerview.selection for multiselection support.

The following positive effects in behavior are observable to end-users:

- Search and navigation actions are executed on IO threads.
- RecyclerViews are now animated during searches (but not navigations).
- Exact scroll position is restored when navigating back.
- The ActionBar title is updated with the current folder name.

The following negative effects may warrant attention:

- Support for the "always search from root" setting has been removed.
- Due to a limitation of the fast scroll dependency, using the scroller
  may result in unwanted multiselections. If this is not fixed in the
  library, native fast scroller capabilities could be used, but these
  are more limited in appearance and to not offer popups.

* Fix lint

* Fix FastScroller/SelectionTracker incompatibility

* Immediately react to settings changes

* List directory entries when search term is blank

* Use isEmpty() instead of == ""

* Replace adapter inheritance with builders and fix selection drags

* Remove dividers in password lists

* Run spotlessApply

* Use a more logical string in action mode

* Commonize and constify path bundle key

* Make lambda parameter name explicit

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>
Co-authored-by: Harsh Shandilya <me@msfjarvis.dev>

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