Support for nominal types via vendor extensions

[danicc097]

It would be very nice to allow branded types through a property e.g. x-orval-type: branded which then generates the schema like type ${schema} = Branded<${type}, "${schema}"> instead of type ${schema} = ${type}>. Very handy for ids, etc. Example: playground

I tried to mess around to see what exactly needs to be changed but can't locate the correct template. A known issue is that mock fields that are branded would will need to be casted as their corresponding schema type.