Starlette-cache

- Fix picklecoder
- Fix connection failure transparency and add logging
- Add Cache-Control and ETag on first response
- Support Async RedisCluster client from redis-py

- Make `request` and `response` optional.
- Add typing info to the `cache` decorator.
- Support cache jinja2 template response.
- Support cache `JSONResponse`
- Add `py.typed` file and type hints
- Add TestCase
- Fix cache decorate sync function
- Transparently handle backend connection failures.

- Add `Cache-Control:no-cache` support.

- Replace `aioredis` with `redis-py`.

- Support `dynamodb` backend.