Give users suggestions on how to resolve `Cannot find implementation or library stub for module named "{module}"`

Feature

Give users suggestions on how to resolve Cannot find implementation or library stub for module named "{module}".

Pitch

I'm new to the ecosystem and didn't know a command that would fix mypy failing is pip install numpy. I think a suggestion on how to resolve this issue would help out people who don't use Python regularly, like myself.

Current behavior

p.py:1: error: Cannot find implementation or library stub for module named "numpy"
p.py:1: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports

Desired behavior

p.py:1: error: Cannot find implementation or library stub for module named "numpy"
p.py:1: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
p.py:1: note: The following command may help: pip install numpy

Inizia dalla diagnostica di mypy per Cannot find implementation or library stub for module named "{module}" e analizza la documentazione esistente sugli import mancanti collegata nel messaggio. Determina come debbano essere selezionati e visualizzati suggerimenti come pip install numpy, quindi verifica che la diagnostica includa un comando utile senza alterare l'output esistente.