Investigate using collection: {min}..{max} to declare fields as "required"

[ribose-jeffreylau]

Motivation

Some fields in Paneron's register are required fields, while some are optional.

LutaML modelling assumes all attributes are optional.

In order to keep compatibility with Paneron, any artifacts generated from this Gem should strive to be as close as possible to what Paneron (RegistryKit) expects.

This issue investigates the possibility of encoding such requirements to LutaML models using cardinality option (collection: {min}..{max}).

[ribose-jeffreylau]

RegistryKit references:

• https://github.com/paneron/registry-kit/blob/master/src/types/register.ts#L5C1-L21C2