Move the actual logic of email parsing to EmailAddress::new() (#3656)

Very small PR; Motivation: Easier navigation using Go-To-definition.

Because, using go-to-definition of rust-analyzer on parse() doesn't take you to the actual parse() implementation but its trait definiton. On the other hand, it's very easy to find EmailAddress::new().

src/contact.rs

@@ -1183,7 +1183,7 @@ impl Contact {
 
 /// Returns false if addr is an invalid address, otherwise true.
 pub fn may_be_valid_addr(addr: &str) -> bool {
-    let res = addr.parse::<EmailAddress>();
+    let res = EmailAddress::new(addr);
     res.is_ok()
 }