Add typing stubs for better type checking support

[inyutin]

Currently, pytesseract lacks type annotations, which prevents static type checkers like mypy from working properly and reduces IDE autocomplete quality.

Add type hints either:

1. Inline in the source code (.py files)
2. As separate stub files (.pyi) with a py.typed marker

[james5635]

I have the same issue. Please, add typing stubs.

[stefan6419846]

You are of course invited to propose a corresponding PR to provide proper typing information.