Add FieldMessage component

[dancoates]

No description provided.

[dancoates]

One thing with this, because it is a component that has some depth, is that I'm not passing props down to the message elements. This could be a bit limiting in the future if someone wants to, for example, put some aria attributes on the message spans to tie them to the relevant inputs. I'm not quite sure what the best way to handle that is. I don't think we can just spam the spans with arbitrary props that the user passes in.

[dxinteractive]

Yeah definitely not, React whinges if you try to set invalid tags on HTML elements.

I wouldn't mind having a standardised prop called htmlProps that accepts an object, specifically for putting arbitrary html attributes on the outermost html element of a component.

[dancoates]

Yeah I like that idea