I've moved all API classes into a separate folder,
as I felt like grouping modules improves readability.
APIs themselves had storage logic which I extracted and put
in another folder. I was originally going with an interface
to the storage to allow for other storage methods than
log entries, but the code was too tightly coupled with it,
so I've left that for another day. Added dependency injection
for all services and used ServiceOptions for config vars.
Bug: T337002
Change-Id: Ie8a1f435d635e1d0e1286f673bfe96cc4fdfe4fe
