Did some refactor, add YouTube as search variant

bot/modules/common/__init__.py

@@ -0,0 +1 @@
+pass

bot/modules/common/song/__init__.py

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+from .song import BaseSongItem

bot/modules/common/song/song.py

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+from attrs import define
+
+
+@define
+class BaseSongItem:
+    name: str
+    id: str
+    artists: list[str]
+    preview_url: str | None
+    thumbnail: str
+
+    @property
+    def all_artists(self):
+        return ', '.join(self.artists)
+
+    @property
+    def full_name(self):
+        return f"{self.all_artists} - {self.name}"
+
+    def __str__(self):
+        return self.full_name