[misc] single_controller: support assign blocking value in runtime

[zw0610]

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What does this PR do?

Allow users to specify blocking in runtime( and turns the blocking value in register as the default value for blocking).

High-Level Design

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Specific Changes

1. register decorator
2. _bind_worker_method
3. func_generator in ray

API

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• Issue Number: Fixes issue # or discussion # if any.
• Training: [Note which backend this PR will affect: FSDP, Megatron, both, or none]
• Inference: [Note which backend this PR will affect: vLLM, SGLang, both, or none]

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@vermouth1992 per our discussion, PTAL.