Add a method to validate email

Signed-off-by: Nikolai Rodionov <iam@allanger.xyz>

internal/services/accounts.go

@@ -105,3 +105,15 @@ func (c *AccountController) Login(ctx context.Context, email, password string) (
 
 	return uuid, nil
 }
+
+func (c *AccountController) IsExist(ctx context.Context, email string) (bool, error) {
+	log := logger.FromContext(ctx)
+	log.V(2).Info("Checking if an account with email exists")
+
+	exists, err := repository.IsAccountExist(ctx, c.DB, email)
+	if err != nil {
+		return false, ErrServerError
+	}
+
+	return exists, nil
+}