Rule S3997: String URI overloads should call "System.Uri" overloads

[valhristov]

RSPEC-3997

String representations of URIs or URLs are prone to parsing and encoding errors which can lead to vulnerabilities. The System.Uri class is a safe alternative and should be preferred.

This rule raises an issue when two overloads differ only by the string / Uri parameter and the string overload doesn't call the Uri overload. It is assumed that the string parameter represents a URI because of the exact match besides that parameter type. It does stand to reason that the safer overload should be used.