v0.8.0: 💎 Feature: Add Polygon.io (Double Redundancy) 💎 (#23)

* still need to write get_splits fx

* made iexcloud subdirs

* start polygon class

* fix test

* init function

* switch to polygon api

* auto dep check

* polygon dividend redundancy added

* tests

* update env var in workflows

* secrets

* fixes?

* fix test

* done