Add HidlSupport.java for utility methods for HIDL.

The old .equals code uses Objects.deepEquals,
which does not handle for, e.g. ArrayList<byte[]>.
Create our own recursive HidlSupport.deepEquals
and deepHashCode method to handle these edge cases.

Bug: 36454147
Test: hidl_test_java
Change-Id: I56dc48985486b561263c260cf43aa90f30d581d0