Add py.typed

[evgeny-stakewise]

Added py.typed marker file to the package directory to indicate that a package supports static type checking.
Without py.typed: Type checkers treat your library as Any, so users won't get type validation for your functions.

UPD Well, adding py.typed is not enough. Actually PR should add type checker and fix all errors found.

---

Note

Low Risk
Packaging-only change that marks the library as typed; no runtime logic changes and minimal risk beyond distribution/config correctness.

Overview
Marks py_clob_client as a typed package by adding the py.typed marker and ensuring it is included in the published distribution via package_data in setup.py, enabling static type checkers to use the library’s type hints.

^{Written by Cursor Bugbot for commit 8633150. This will update automatically on new commits. Configure here.}

[Copilot]

Pull request overview

This PR adds type checking support to the package by including a py.typed marker file, enabling type checkers like mypy to validate types when users import this library.

Changes:

• Added py.typed marker file configuration to setup.py

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[evgeny-stakewise]

Well, adding py.typed is not enough. Actually PR should add type checker and fix all errors found.
I set WIP for now.