Ensure password isn't logged accidentally

Author: mattcreaser

authenticator/src/main/java/com/amplifyframework/ui/authenticator/data/UserInfo.kt

@@ -7,4 +7,10 @@ internal data class UserInfo(
     val password: String?,
     val signInSource: SignInSource,
     val selectedAuthFactor: AuthFactor? = null
-)
+) {
+    override fun toString() = "UserInfo(" +
+        "username=$username, " +
+        "password=***, " +
+        "signInSource=$signInSource, " +
+        "selectedAuthFactor=$selectedAuthFactor)"
+}