Use `useConfig` instead of the <FormKitProvider>

Currently we are injecting a higher order component `<FormKitProvider>` into the SFC file, but this is really unnecessary since we no longer inject a lazy provider to check for suspense. We could isntead just use the `useConfig` composable. This would also mean we dont need to mess with the SFC template at all, which is causing bugs like formkit/formkit#1266.