sub-repo for performance optimisations in a lower level language

[samukweku]

would it make sense, and be acceptable to the team, to have a sub-repo within pyjanitor-devs (like pyjviz), but focused on performance within a lower level language (cython, rust, c, ...). that way it is not conflated with core pyjanitor, and yet we can steal perf. I'm thinking of it, especially now that we are supporting polars, there are some cases where we may have to write extensions to get performance boost within polars (an example is strip_accents within clean_names does not take advantage of Polars' built-in functions, because there is no support for it - with this proposal, we could potentially write it in rust and pass it to polars engine for more performance). Of course, we could also use it for Pandas (my target at the moment is conditional_join, but this could potentially help with other functions).

@pyjanitor-devs/core-devs @ericmjl