Support for Field data prop

### Are you submitting a **bug report** or a **feature request**?

Feature request

### What is the expected behavior?

I expect to be able to use data prop on Field. Fields in Final form support `data` prop, but in react-final-form Field `data` prop is ignored. Is there a reason to not implement it or it wasn't a priority?

Start by inspecting the Field API in react-final-form and comparing it with how the data prop is supported in Final Form. Trace how Field props are passed and identify the relevant existing tests; done means the data prop is accepted and exposed consistently, with coverage for the expected behavior.

Written by the indexing model from the issue text.