py.typed file / type stubs are missing

Describe the bug
The polygon package does not export its type information to mypy, which causes mypy to fail when used on downstream packages

To Reproduce

1. Download examples/stocks-daily_open_close.py or any other example file
2. mypy stocks-daily_open_close.py
3. Observe the following error:

stocks-daily_open_close.py:1: error: Skipping analyzing "polygon": module is installed, but missing library stubs or py.typed marker  [import-untyped]
stocks-daily_open_close.py:1: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
Found 1 error in 1 file (checked 1 source file)

Expected behavior
The type checks should pass

Additional context
I think all that is needed is to add the missing py.typed file to the polygon package

Bắt đầu bằng cách xác định gói polygon đã cài đặt và tái hiện báo cáo với examples/stocks-daily_open_close.py bằng mypy. Kiểm tra để đảm bảo gói xuất thông tin kiểu của nó như được mô tả trong issue, sau đó xác minh rằng ví dụ vượt qua kiểm tra kiểu mà không có lỗi thiếu stub.