Refactor code structure for improved readability and maintainability

stubs/yt_dlp/__init__.pyi

@@ -0,0 +1,13 @@
+from collections.abc import Mapping
+from types import TracebackType
+
+class YoutubeDL:
+    def __init__(self, params: Mapping[str, object] | None = ...) -> None: ...
+    def __enter__(self) -> YoutubeDL: ...
+    def __exit__(
+        self,
+        exc_type: type[BaseException] | None,
+        exc: BaseException | None,
+        traceback: TracebackType | None,
+    ) -> bool | None: ...
+    def extract_info(self, url: str, download: bool = ...) -> object: ...

stubs/yt_dlp/utils.pyi

@@ -0,0 +1,2 @@
+class DownloadError(Exception): ...
+class UnsupportedError(DownloadError): ...