style: fix method ordering in ChannelBatchSpanProcessor

Move ensureInitialized() after public methods per PHP-CS-Fixer
ordered_class_elements rule.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: lucas-angeli-gimenes

src/SpanProcessor/ChannelBatchSpanProcessor.php

@@ -49,19 +49,6 @@ public function __construct(
     ) {
     }
 
-    private function ensureInitialized(): void
-    {
-        if ($this->initialized) {
-            return;
-        }
-
-        $this->initialized = true;
-        $this->exportContext = Context::getCurrent();
-        $this->channel = new Channel($this->channelCapacity);
-        $this->startConsumer();
-        $this->startFlushTimer();
-    }
-
     public function onStart(ReadWriteSpanInterface $span, ContextInterface $parentContext): void
     {
     }
@@ -116,6 +103,19 @@ public function shutdown(?CancellationInterface $cancellation = null): bool
         return $this->exporter->shutdown($cancellation);
     }
 
+    private function ensureInitialized(): void
+    {
+        if ($this->initialized) {
+            return;
+        }
+
+        $this->initialized = true;
+        $this->exportContext = Context::getCurrent();
+        $this->channel = new Channel($this->channelCapacity);
+        $this->startConsumer();
+        $this->startFlushTimer();
+    }
+
     private function pushBatch(): void
     {
         if ($this->batch === [] || $this->channel === null) {