allow to reset form with new values

[schiller-manuel]

After form submission I want to keep the form open and make the form pristine again, but don't want to lose the current values.

Inspiration: In RHF this is possible via calling reset with new values: https://www.react-hook-form.com/api/useform/reset/

[crutchcorn]

Closing, as I'm moving this to an issue to track:

#785

This would be a good first issue if you wanted to make a PR :)