Add some Process APIs to test_current

In order to test MODULE_LIBRARIES System APIs, the
@TestApi annotation needs to be explicitly added. Also adds
some whitespace changes which were autogenerated when
updating the APIs. Also renames Process.toAppUid().

Test: atest ProcessTest
Bug: 218723058
Change-Id: I49bee200c267550b9616ad0b43022126d2d7cc4b