pass parameters to exported_java_aconfig_library

This change add new parameters to exported_java_aconfig_library.

* use_new_storage: it reads the value of build flag
  RELEASE_READ_FROM_NEW_STORAGE. If it is true the generated code will
  use new storage

* use_new_exported: it reads the value of build flag
  RELEASE_ACONFIG_NEW_EXPORTED. If it is true the generated code will
  generate new exported code.

Test: presubmit
Bug: 329250927
Change-Id: I060a96a308b6fe21ed20970a80e6a9326532ca95