[build] Add transitional setup.py and pyinst.py (#9296)

Authored by: bashonly, Grub4K, pukkandan

Co-authored-by: Simon Sawicki <contact@grub4k.xyz>
Co-authored-by: pukkandan <pukkandan.ytdlp@gmail.com>

pyinst.py

@@ -0,0 +1,17 @@
+#!/usr/bin/env python3
+
+# Allow execution from anywhere
+import os
+import sys
+
+sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+
+import warnings
+
+from bundle.pyinstaller import main
+
+warnings.warn(DeprecationWarning('`pyinst.py` is deprecated and will be removed in a future version. '
+                                 'Use `bundle.pyinstaller` instead'))
+
+if __name__ == '__main__':
+    main()