[Feature] Improve Exception handlers

[montezdesousa]

1. Why?

   • Errors return by API are not consistent.

2. What?

• API errors

Status code	Exception	Detail	Description
400	OpenBBError or child of OpenBBError	Custom message.	Use this to explicitly raise custom exceptions, like EmptyDataError.
422	ValidationError	Pydantic errors dict message.	Automatically raised to inform the user about query validation errors. ValidationErrors outside of the query are treated as 500 by default.
500	Any exception not covered above, eg ValueError, ZeroDivisionError	Unexpected error.	Unexpected exceptions, most likely a bug.

• Python errors are similar but parse the detail in a readable format for both Python and CLI users

3. Impact

   • API errors and Python errors

4. Testing Done:

• API examples

• Python equivalent

from openbb import obb
obb.equity.price.historical(symbol="milj", provider="fmp", interval="1d", start_date="2024-05-15")
obb.equity.price.historical(symbol="aapl", provider="XYZ", interval="1d", start_date="2024-05-15")
obb.equity.price.historical(symbol="aapl", provider="fmp", interval="1D", start_date="2024-05-15")

[hjoaquim]

This should go to the docs website.
We should consider deprecate this document and just point potential contributors to the website instead.

cc @IgorWounds @montezdesousa