Create 'cc_prebuilt_test_library_shared' module type

This new module type allows cc_test modules to depend on prebuilt
shared libraries and have them included as data dependencies alongside
the test binary.

Test: Manually verified to facilitate mk-to-bp migration of
bionic-unit-test prebuilt dependencies (aosp/1339035)

Change-Id: Idbac0854f1f9e2e01bbfa63591de458b61733e17