[Notifier] Add from in SmsMessage and support it in bridge transports

Author: alamirault

CHANGELOG.md

@@ -1,6 +1,11 @@
 CHANGELOG
 =========
 
+6.2
+---
+
+ * Use `SmsMessage->from` when defined
+
 6.1
 ---
 

SmsapiTransport.php

@@ -88,11 +88,13 @@ protected function doSend(MessageInterface $message): SentMessage
             throw new UnsupportedMessageTypeException(__CLASS__, SmsMessage::class, $message);
         }
 
+        $from = $message->getFrom() ?: $this->from;
+
         $endpoint = sprintf('https://%s/sms.do', $this->getEndpoint());
         $response = $this->client->request('POST', $endpoint, [
             'auth_bearer' => $this->authToken,
             'body' => [
-                'from' => $this->from,
+                'from' => $from,
                 'to' => $message->getPhone(),
                 'message' => $message->getSubject(),
                 'fast' => $this->fast,