bp2build converter for ndk_library

ndk_libary will be converted to a cc_stub_suite target. Its api_surface
attribute will be publicapi

The headers corresponding to this stub target will be added in a followup bug
(tracked in b/300504837)

Bug: 298085502
Test: Added a unit test
Change-Id: If9745083b18e0bcf5ecb89229a0f709b949d401c