Katana style scope control for URLFinder

[fail-open]

Please describe your feature request:

Please port over the field scope control functionality from katana to urlfinder (dn, rdn, fqdn). It would help give a lot more control over the results.

SCOPE:
   -us, -url-scope string[]       in scope url regex to be followed by urlfinder
   -uos, -url-out-scope string[]  out of scope url regex to be excluded by urlfinder
   -fs, -field-scope string         pre-defined scope field (dn,rdn,fqdn) or custom regex (e.g., '(company-staging.io|company.com)') (default "rdn")
   -ns, -no-scope                   disables host based default scope
   -do, -display-out-scope          display external endpoint from scoped urls

Describe the use case of this feature:

It would be helpful to be able to pass in a domain and request either all results for all of the subdomains, or just the fqdn specified.