Assign TFieldsValues to fieldsValues instead of transformedValues

[SeokminHong]

Resolves #39

Support for the TransformedValues type was raised in issue #34. The example in that issue showed that when using Zod together with @hookform/resolvers/zod, there is no type support when the input and output differ.

This was addressed in commit fc6c0a4 by passing TransformedValues to the generic of useLens instead of the control’s FieldValues. However, a lens only deals with the input side of the form and does not concern itself with the submission type after resolution, so this change is inappropriate.

Suppose we have a Zod schema like the following.

const FormSchema = z.object({
  a: z.string().transform(value => Number.parseInt(value, 10)),
});
type FormInput = z.input<typeof FormSchema>;
type FormOutput = z.output<typeof FormSchema>; // Same as z.infer

// input: FormInput, output: FormOutput
const formMethods = useForm({ resolver: zodResolver(FormSchema) });

In this case, the form’s input type is FormInput, and the submitted data type should be FormOutput.

[aspirisen]

@SeokminHong thank you for the fix

[github-actions]

🎉 This PR is included in version 0.8.3 🎉

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