Description param in Request dataclass is not always as declared

[gha88]

In method parse, defined in request.py, when looking for the description attribute it can be left as a string even if declared as Description.

description = data.get("description") if isinstance(description, dict): description = Description.parse(description)

I can see two possible solution:

• declare in Request objcet the attribute description as Union[Description|str]
• convert the string only parameter to a Description object anyway