Py115

Changes:
- Use `httpx` as underlying HTTP client instead of requests.
- Expose lowlevel APIs.
- **BREAKING: Refactor public APIs and types.**

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**🎂 HAPPY 1ST BIRTHDAY TO MY DAUGHTER! 🎂**

Changes:
1. Refactor QRcode login API.
2. `StorageService.request_play` calls different HTTP API for Web and PC.
3. Add API `StorageService.batch_rename`.
4. Accept dict or class as credential in `Cloud.__init__` and `Cloud.import_credential`.
5. Add timeout for all HTTP API requests, automatically retry when calling HTTP API timeout.

Bug Fixes:
1. Fix type error in `StorageService.make_dir` by 0xfeedface1993 .

Changes:

* Do not use StrEnum which is not supported on Python 3.9.
* Rename `LoginPlatform` to `AppType`.
* Fix docs building failed issue.

Bug Fixes:
* Fix int.to_bytes error under python 3.11.

Changes:
* Add QRcode login API.
* Add request play API.

Implement basic features, include:

* Common file operations.
* Download/Upload file.
* Offline task management.

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实现了基本的功能，包括：

* 常规文件操作
* 上传/下载文件
* 离线任务管理