This change automatically removes options and sync attributes when
sanitizing fields that don't support them. As per values, it returns
an error when the value for a text type field is longer than the 64
characters limit we're currently applying.
The PR fixes a bug on the create CPA field endpoint that was causing
the attrs of the CPAField not to be decoded correctly.
Co-authored-by: Miguel de la Cruz <miguel@ctrlz.es>
3df7bfca88