Generate enum for VehicleProperty annotations.

Add a script to general Java and CPP files for annotations in
VehicleProperty.aidl. By having the enums defined, both VHAL impl
(CPP) and Car Service (Java) can more easily access these annotations.
For example, AIDL impl can generate a default config based on these
annotations so that it meets the requirements. Car service side can
generate CTS checks automatically based on these enums to verify
that the VHAL impl is providing the correct config.

Test: Add VehiclePropertyAnnotationCppTest and
VehiclePropertyAnnotationJavaTest that will fail if we update
the VehicleProperty.aidl without running geenrate_annotation_enums.
Bug: 236433737

Change-Id: Ib3e0dee7a28576bc9535d10c7c8f799f1506e592