Adding handle types to Java-compatible test HALs

This change adds HIDL handle types to the baz@1.0 and safeunion@1.0 test
HALs to exercise native handles in Java.

Bug: 35098567
Test: Ran the hidl_test (C++ and Java) suites
Change-Id: Iddf1c269cbdc68ce337f1e787570f3810f7baad2
4 files changed