Only wrap known statuses in Status responses on CompositeStreamConnection (#1734)

Since #1293, StreamConnection only returns a Status for OK, QUEUED, NOKEY and PONG. ProtocolProcessor and the StatusResponse handler, used by CompositeStreamConnection, still wrapped every simple string.

Fixes #1147

Co-authored-by: Vladyslav Vildanov <117659936+vladvildanov@users.noreply.github.com>

tests/Predis/Protocol/Text/ProtocolProcessorTest.php

@@ -72,6 +72,26 @@ class ProtocolProcessorTest extends PredisTestCase
         $this->assertNull($protocol->read($connection));
     }
 
+    /**
+     * @group disconnected
+     */
+    public function testReadsOnlyKnownStatusesAsStatusResponses(): void
+    {
+        $protocol = new ProtocolProcessor();
+
+        $connection = $this->getMockConnectionOfType('Predis\Connection\CompositeConnectionInterface');
+        $connection
+            ->expects($this->exactly(2))
+            ->method('readLine')
+            ->willReturnOnConsecutiveCalls(
+                '+OK',
+                '+string'
+            );
+
+        $this->assertInstanceOf('Predis\Response\Status', $protocol->read($connection));
+        $this->assertSame('string', $protocol->read($connection));
+    }
+
     /**
      * @group disconnected
      */