Add isDecorated method on SymfonyOutput class and Output interface

Author: williamdes

src/Output.php

@@ -43,4 +43,5 @@ public function isVerbose(): bool;
 
 	public function isDebug(): bool;
 
+	public function isDecorated(): bool;
 }

src/Symfony/SymfonyOutput.php

@@ -87,4 +87,8 @@ public function isDebug(): bool
 		return $this->symfonyOutput->isDebug();
 	}
 
+	public function isDecorated(): bool
+	{
+		return $this->symfonyOutput->isDecorated();
+	}
 }