[android] improve unsupported scalar type error message for android
Summary: Android only support a few scalar types as model return value. This diff improved the error message so user can know which type is not supported.
Test Plan: verified unsupported scalar type is printed
Differential Revision: D35104788
Pull Request resolved: https://github.com/pytorch/pytorch/pull/74660
Approved by: https://github.com/kit1980
