[#F490029EC79B93CB45B28AF269B7C3C44F15A670]
Return true if a password is present
bool has_password() const noexcept;
This function returns true if the userinfo is present and contains a password.
assert( url_view( "http://jane%2Ddoe:pass@example.com" ).has_password() );
Constant.
Throws nothing.
userinfo = user [ ":" [ password ] ]
user = *( unreserved / pct-encoded / sub-delims )
password = *( unreserved / pct-encoded / sub-delims / ":" )