Rename Options to JavaOptions

The aidl command line interface exposes a lot of knobs that
are not used in practice and complicate the internal logic to support.
For C++ generation we have an opportunity to reduce the exposed surface.

Begin by renaming Options to a more specific JavaOptions.

Test: unittests pass
Bug: 23599341

Change-Id: I76478ab2fb12612bf7120a1af28c8db1da9ed22f
8 files changed