Add email address validation and RPC method to set email

src/Socialbox/Classes/Validator.php

@@ -18,6 +18,17 @@ class Validator
         return preg_match(self::PEER_ADDRESS_PATTERN, $address) === 1;
     }
 
+    /**
+     * Checks if the provided email address is in a valid email format.
+     *
+     * @param string $emailAddress The email address to be validated.
+     * @return bool Returns true if the email address is valid, otherwise false.
+     */
+    public static function validateEmailAddress(string $emailAddress): bool
+    {
+        return filter_var($emailAddress, FILTER_VALIDATE_EMAIL) !== false;
+    }
+
     /**
      * Validates a username
      *