feat(conform-zod): strip empty value

[edmundhung]

Fix #196.

This adds an extra option on parse to strip all empty value. This is an opt-in feature for now and very likely the default on v0.8.

// Instead of this:
const schema = z.object({
  text: z.string().min(1, 'Email is required');
});

const submission = parse(formData, { schema });

// Do this:
const schema = z.object({
  email: z.string({ required_error: 'Email is required'),
});

const submission = parse(formData, { schema, stripEmptyValue: true });

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