Add a `require_tld` option to `URL` constraint

[Blacksmoke16]

• New MISSING_TLD_ERROR with new UUID value
• New require_tld : Bool = true constructor property and tld_message : String = "This URL does not contain a TLD."
  • Will release this as a new minor as this is technically breaking
• If true, URI.parse the value to extract the hostname
  • Add the violation if it does not contain a . or is a valid IP address