Pandabear

Fix

- `check_schemas` did not work for many use cases. This commit greatly simplifies how it works: now uses recursive function to check inputs at arbitrary depth, both in input and output

Refactor

- **BaseModel-and-children**: Move `_validate_series` to BaseModel parent class

Fix

- **fix-import**: import CHECK_NAME_FUNCTION_MAP from pandabear.column_checks, not pandabear.model_components

Fix

- isort
- **fix-output-validation**: added a recursive output validation check

Feat

- **add-support-for-Series-runtime-type-checking**: added Series and SeriesModel classes, as well as tests demonstarting their basic function

Feat

- first commit