Include type hints in function parameters

Hi,

Static type checkers (mypy, pyright/pylance) are becoming increasingly popular in the python world.
For now they don't work with Dash as there are no type annotations included with the library.

From what I understand, python code for dash components as well as their docstrings are somehow transpiled from javascript? If so, adding type hints should be relatively straightforward as it appears that the docstrings already contain very detailed typing information. This would significantly improve QOL for users using type checkers (which includes the majority of the vscode userbase since vscode uses pylance by default).

For reference, plotly has also started adding typing information to their functions - see for instance https://github.com/plotly/plotly.py/pull/3425#issuecomment-1117210067 .

Inizia tracciando come il codice Python e le docstring dei componenti Dash vengono transp ilati da JavaScript, poiché l’issue lo identifica come la probabile fonte delle informazioni sui tipi. Controlla le interfacce risultanti con mypy e pyright/pylance; il lavoro è completato quando le funzioni Dash espongono annotazioni di tipo utilizzabili dai type checker statici.