Allowing optional bodies instead of forcing required=true

[ScepticMatt]

We cannot have optional bodies like using Type.Optional<...> or Type.Undefined in TypeBox because fets hardcodes/overwrites it to required = true

https://github.com/ardatan/feTS/blob/5fa978026f5db6ec91ab755e4d47cb06b2e73e48/packages/fets/src/plugins/openapi.ts#L193C9-L202C10

what is the reason you are doing this? Optional bodies is a valid use case.