Add support for error messages in <Form.Field/>

[bubunyo]

Feature Request

Problem description

Some errors might require the developer to give the user some context on what went wrong. And this will most likely happen by showing an error message. But the Form.Field component lacks this functionality.

Proposed solution

To extend the error prop to not only accepts bools, but also strings to be shown as error messages. There is currently no css to support this feature.

MVP

Something as simple as this

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