Convert octave integer scalars into closest java type (bug #44882) * libinterp/octave-value/ov-java.cc (unbox): when calling a java method, octave core types should be converted automatically into equivalent java types. In the case of integers, we must pick the closest one but at the moment all were being converted to Integer (int32_t). This fixes it, even if it meas to lose data (as is the case in some of the added tests). Also reduce some code duplication by using macros since the code is similar to the code for float and doubles.