Expose Output::isDecorated

This can be used by an ErrorFormatter to determine if `--ansi` or `--no-ansi` was used.

A use case can be to toggle rendering of colors or hyperlinks.

When ansi is not enabled, one might want to render a link differently.

Author: ruudk

src/Command/Output.php

@@ -18,4 +18,6 @@ public function isVerbose(): bool;
 
 	public function isDebug(): bool;
 
+	public function isDecorated(): bool;
+
 }

src/Command/Symfony/SymfonyOutput.php

@@ -49,4 +49,9 @@ public function isDebug(): bool
 		return $this->symfonyOutput->isDebug();
 	}
 
+	public function isDecorated(): bool
+	{
+		return $this->symfonyOutput->isDecorated();
+	}
+
 }