Cachetoolsutils

- Add license section to README.
- Add `ruff` pass.
- Add _Pypy 3.10_ and _Python 3.13_ to CI.

- improved typing
- updated CI

- improved doc
- improved type checking

- Fix `TwoLevelCache` verbosity
- Add `DebugCache` class
- Sort keys on JSON dumps.
- Upgrade GitHub actions.
- Test with Python *3.12*.
- Improved documentation.

Improved tests.

- Add `LockedCache` class for shared cache and threading.
- Add `DictCache` class for dict-based cache.
- Add resiliency option to `TwoLevelCache`.
- Add extended `cached` decorator with `in` and `del` support.
- Use base85 instead of base64 for MemCached keys.
- Improved documentation following diátaxis advices.
- Hide some private internals.