* add econometrics basics
* actual function
* stuff
* Edit df helpers to make function work as expected
* Get this to work
* Exclude from web api
* More functions + lint
* Cointegration + lint
* add causality
* add unitroot
* merge + update
* add to_polars :D
* add to_numpy
* aha. I can now do multi index in basemodels
* Add panel models!
* Add tests for my multi index stuff
* cache pip envs on testing
* life can be ruff sometimes
* move package to openbb_sdk
* avoid test writing files
* black
* revert toml changes, will do it in another PR
* run build in a separate process
* change error msg
* rename func
* change msg
* rename func + msg
* change param name
* update readme
* lazy load some deps
* Update README.md
* modules is better
* doc