ref(scraps): unify FormWrapper and AppForm

[TkDodo]

This is a breaking change in the form API, so once we merge this, all open PRs need to update.

before:

<form.AppForm>
  <form.FormWrapper>
    ...
  </form.FormWrapper>
</form.AppForm>

after:

<form.AppForm form={form}>
  ...
</form.AppForm>

[JonasBa]

Great little quality of life consolidation 🙏🏼

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