Currently the only way way to [configure](https://microsoft.github.io/mimalloc/environment.html) underlying mimalloc is to use env variables, but it's very useful to set them up programatically. So the idea is to add rust bindings for mi_option_set: https://microsoft.github.io/mimalloc/group__options.html#gaf84921c32375e25754dc2ee6a911fa60