Add additional entries to .gitignore

[nightlark]

I noticed some individual user/machine specific files have been committed to some of the language binding repositories, and that the .gitignore files are missing some entries that would prevent accidentally committing those files.

Additional .gitignore entries to include for this repository: https://github.com/github/gitignore/blob/main/Python.gitignore https://github.com/github/gitignore/blob/main/Global/MATLAB.gitignore https://www.toptal.com/developers/gitignore/api/python,matlab -- looks like it might just be a combining the previous two files

Some OS-related .gitignore options to consider adding as well: https://github.com/github/gitignore/blob/main/Global/Windows.gitignore https://github.com/github/gitignore/blob/main/Global/Linux.gitignore https://github.com/github/gitignore/blob/main/Global/macOS.gitignore

And possibly this extra one for Python (though I think the Python.gitignore covers most of these, and it looks like the gitignore in this repository already has a copy of everything in here): https://github.com/github/gitignore/blob/main/Global/VirtualEnv.gitignore