Asgiwebdav

- Add `examples.work_together_with_other_asgi_app.py`, thanks [davidbrochart](https://github.com/davidbrochart)
- LDAP is now optional
- uvicorn is now optional
- `FileSystemProvider` uses more aiofiles API
- Change `DAVRequest.depth`'s default value from `DAVDepth.infinity` to DAVDepth.d0
- PROPFIND will return 200 if only one DAV property response in the return

- Broken change
- Change Config.compression.user_content_type_rule to Config.compression.content_type_user_rule
- Add more support for HTTP header: Range
- Fix HTTP Digest rules checker
- Add a new property DAVResponse.compression_method

- Add new feature: CORS
- Reduce Docker image size

- Broken change
- Remove feature: DirBrowserIgnore
- Change docker base image from slim -> alpine,
- Add non-root support in docker container
- Add new feature: hide file in directory
- Add hashlib support for stored password
- Add LDAP support for stored password

- Fix bug

Add `Config.http_digest_auth.enable_rule`