Feature request: Add schema also for Headers

[IngBertolini]

Hello! Like the title suggests, currently the schema suppors only the following fields

type SchemaTypeBox = {
    params?: TSchema;
    querystring?: TSchema;
    body?: TSchema;
    response: Record<number, TSchema>;
};

It would be nice to have also the headers fields in order to have type checking also for that

[flodlc]

Hi, thanks for the suggestion. It's totally feasable but not have time now. Could you make a PR that implements the feature ?