[Feature][Dubbo-python] Implement the basic functions of an RPC framework.

[cnzakii]

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Apache Dubbo Component

Python SDK (apache/dubbo-python)

Descriptions

This is a subtask of the GSoC project. (Relevant repository: dubbo-python)

The completed milestones include:

1. User API Calls: Users can reference and expose services through the Client and Server.
2. Proxy Layer: Abstracted and implemented RpcCallable (Proxy) and ServiceHandler (Invoker).
3. Protocol Layer: Implemented the Triple protocol, fully compatible with the gRPC protocol. Also supports multiple compression methods, including Identity, Gzip, and Bzip2.
4. Transport Layer: Based on asyncio and combined with the h2 library, the Http2 protocol is implemented, along with connection-level DATA frame flow control, stream-level frame inbound and outbound order control, and stream multiplexing. And it supports significantly improving asyncio's performance by incorporating uvloop.
5. Serialization Layer: Supports user-defined serialization and deserialization methods.
6. Plugin Extension Mechanism: Achieved plugin registration and loading through importlib and registries.
7. Logging Wrapper: Abstracted and encapsulated logging, including log coloring, console output, and log file output.

Note:
According to the official report from uvloop(http://magic.io/blog/uvloop-blazing-fast-python-networking/), using uvloop is 2-4 times faster than using asyncio alone. The reason for not using uvloop fully is that its not supported on windows.

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[cnzakii]

Completed in apache/dubbo-python#34