Backports functools.lru_cache

This library provides a backport of the `functools.lru_cache` decorator, originally introduced in Python 3.2, primarily for use in older Python environments (e.g., Python 2.7, 3.2-3.5). For Python versions 3.8 and newer, it acts as a no-op, internally importing the built-in `functools.lru_cache` for compatibility. The current version is 2.0.0, released in December 2023, with updates occurring on an as-needed basis rather than a fixed cadence.