Add system tests for reading/writing in matlab

[acampbel]

Cool project! Consider adding some system tests that generate mat files across multiple releases of matlab to be read by your library and/or validate that may files written by your library can be read correctly into matlab across multiple releases. These actions support github hosted runners back to 20a:

https://github.com/matlab-actions

[S-Dafarra]

Hi @acampbel, thanks a lot for the suggestion! Did you encounter any issue, by any chance?

In any case, right now the supported types of mat files correspond to those supported by matio. matio-cpp is supposed to be only a C++ interface of matio.