Sort api files by api surface in java_api_library

metalava requires api files to be sorted in the narrower api scope to
the wider api scope when passed as inputs. Previously, the api files
were sorted based on the naming convention, but some api files in
prebuilts do not necessarily follow the naming convention (i.e.
*-current.txt). Therefore, utilize the api surface information provided
by the java_api_contribution provider instead of the naming convention
to sort the api files.

Test: m nothing
Bug: 300175323
Change-Id: I8466db712bff8fef906186bd272d85682877533d