Support other type on the @default directive.

[MacondoExpress]

The @default directive does not support several types.
It will be good to add support for at least the types already supported by the @populatedBy.

For instance, the following typeDefs is not currently supported:

type typeNode {
    durationField: Duration @default(value: "P1D")
}

[MacondoExpress]

Initial PR #5437 was introduced to fix this case on the v6 POC that was dismissed and needs to be backported to v6.