Validate dataclass with optional field and default

[kennyworkman]

>>> @dataclass(frozen=True)
... class MAuth:
...     token: str
...     notebook_id: str
...     user_id: Optional[str] = None
a = {'notebook_id': '204', 'token': 'Latch-Session-Token dba3dcf605337e67fa1a3d55bf220637'}
>>> untraced_validate(a, MAuth)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/kenny/latch/plots-faas/.venv/lib/python3.12/site-packages/latch_data_validation/data_validation.py", line 177, in untraced_validate
    raise DataValidationError(
latch_data_validation.data_validation.DataValidationError:
Dataclass did not match schema:
  Missing fields:
      - 'user_id'
  {'notebook_id': '204', 'token': 'Latch-Session-Token dba3dcf605337e67fa1a3d55bf220637'}
  did not match
  <class '__main__.MAuth'>