Typing stubs for paho-mqtt

This library provides PEP 561 compliant typing stubs for the `paho-mqtt` client library, enabling static type checking tools like MyPy to verify correct usage of `paho-mqtt` APIs. It is part of the `typeshed` project, which centrally maintains type hints for many popular Python packages. The current version, `1.6.0.20240321`, corresponds to `paho-mqtt` version 1.6.0. As a typeshed package, it updates periodically as the upstream library changes or as typeshed contributors enhance the stubs.