🚧 Add stream to map

Still need to handle the codecs. But almost there.

src/Map.php

@@ -4,11 +4,12 @@ namespace Danjones\FFMpeg;
 
 class Map
 {
+    use Traits\HasMetadata;
+
     protected MappableMedia $media;
     protected string $path;
     /** @var Stream[] */
     protected array $streams = [];
-    protected array $metadata = [];
 
     public function __construct(MappableMedia $media)
     {
@@ -29,15 +30,22 @@ class Map
         return $this;
     }
 
-    public function addMetadata(array|string $keyOrData, string $value = null): static
+    public function stream(callable $callback = null): Stream|static
     {
-        if (is_array($keyOrData)) {
-            array_walk($keyOrData, fn($v, $k) => $this->addMetadata($k, $v));
-
-            return $this;
+        $stream = new Stream($this);
+        if (!$callback) {
+            return $stream;
         }
 
-        $this->metadata[$keyOrData] = $value;
+        $callback($stream);
+        $this->saveStream($stream);
+
+        return $this;
+    }
+
+    public function saveStream(Stream $stream): static
+    {
+        $this->streams[] = $stream;
 
         return $this;
     }