Support for asyncio based workers

The current worker implementation model uses multiprocessing for parallel execution but each process blocks on task execution (though it might be waiting on I/O). Is there a possibility to use asyncio/threaded approach to alleviate this problem and think of a model where processes could be used for parallelization (using multiple cores) and each process has an event loop/ThreadPool to poll and execute tasks to maximize performance on each core ?

I'd be happy to discuss more on this and submit a PR if required as well. Thanks for all the awesome work so far 👍

首先检查当前的 multiprocessing worker 实现及其阻塞式任务执行路径。在开始编码之前，明确所需的 asyncio/threaded 进程与事件循环模型、性能目标和验收标准；该 issue 目前描述的是设计讨论，而不是范围明确的变更。

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