[Feat] local api speed up with fixed concurrent users

[yingfhu]

Our api only has query_per_second to restrict speed, to fulfill the the satisfaction of concurrent users when use a private key. Implement LocalAPIRunner.

Please use LocalAPIRunner in config and it only for api model infer.

max_num_workers, total number of subprocess.
concurrent_users, total number of concurrent user for online generation.

infer = dict(
    partitioner=dict(type=NaivePartitioner),
    runner=dict(
        type=LocalAPIRunner,
        max_num_workers=4,
        concurrent_users=10,
        task=dict(type=OpenICLInferTask)),
)

Model files should be modified correspondingly to suit this need.
One can refer to ZhiPuAI API model for reference

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Modification

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Checklist

Before PR:

• Pre-commit or other linting tools are used to fix the potential lint issues.
• Bug fixes are fully covered by unit tests, the case that causes the bug should be added in the unit tests.
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