Return the password.
pct_string_view encoded_password() const;
This function returns the password portion of the userinfo as a percent-encoded string.
assert( url_view( "http://jane%2Ddoe:firstname.lastname@example.org" ).encoded_password() == "pass" );
userinfo = user [ ":" [ password ] ] user = *( unreserved / pct-encoded / sub-delims ) password = *( unreserved / pct-encoded / sub-delims / ":" )