[cleanup, utils] Split into submodules (#7090)

Closes https://github.com/yt-dlp/yt-dlp/pull/2173

Authored by: pukkandan, coletdjnz
Co-authored-by: pukkandan <pukkandan.ytdlp@gmail.com>

yt_dlp/utils/__init__.py

@@ -0,0 +1,14 @@
+import warnings
+
+from ..compat.compat_utils import passthrough_module
+
+# XXX: Implement this the same way as other DeprecationWarnings without circular import
+passthrough_module(__name__, '._legacy', callback=lambda attr: warnings.warn(
+    DeprecationWarning(f'{__name__}.{attr} is deprecated'), stacklevel=5))
+del passthrough_module
+
+# isort: off
+from .traversal import *
+from ._utils import *
+from ._utils import _configuration_args, _get_exe_version_output
+from ._deprecated import *