Allow StringEnum to have a default value

When creating a Enum you are able to provide a default value.

status: Type.Enum(TRANSACTION_STATUS, { default: TRANSACTION_STATUS.INCOMPLETE }),

But when creating a StringEnum you do not have that option available.

status: StringEnum(['INCOMPLETE', 'COMPLETED', 'CANCELLED', 'APPROVED', 'DECLINED'])

I would like this to work

status: StringEnum(['INCOMPLETE', 'COMPLETED', 'CANCELLED', 'APPROVED', 'DECLINED'], {
    default: 'COMPLETED'
}),

I can provide a PR for my suggestion to a fix

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