map varchar(n) to Field(..., max_length=n) when targeting a pydantic model type

[faccini-bs]

Is your feature request related to a problem? Please describe.
The pydantic BaseModel (as well as dataclasses) validate the data on instantiation

Describe the solution you'd like
starting from FIELD1 VARCHAR(256)
instead of generating field1: str generate field1: str = Field(..., max_length=256)

Additional context
I like this project and think this is a step forward to make it more useful