Stuff to do to enhance field info generation for forms

[jfet97]

1. support for S.nullable(X) or S.optional(X) where X is not a primitive, but a struct or a class.
2. support arrays and tuples
3. find an alternative to Unbranded

[patroza]

@jfet97 some more ideas;

• explore Schema's ArrayFormatter for detailed errors/simpler parsing. right now we use the jsonschema properties, and then fallback to a decode call, and then parse the string tree
• support filters (for classes it's upcoming in schema-next), e.g email/confirmEmail, password/confirmPassword relations can be modelled with filters, so that we don't have to manually add validation for that in the forms, but it is just picked up from the schema; https://discord.com/channels/795981131316985866/1235145167871152138/1235217536371523594