Sorry for my late response, for some reason it got into spam.

Yes, it will be a part of the phpMyAdmin repository. I actually started working on it and refactored pieces of code related to phpMyAdmin. I decided to use the autoloader in Composer, but I edited it a little bit. I still have have some doubts about the tests, because my tests also include a bootstrap file and I'd prefer to avoid editing the bootstrap that phpMyAdmin uses now, but I will probably just merge the two bootstraps. I will push my changes to my fork soon.