[Serve] Support serializing numpy scaler #24512
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Why are these changes needed?
In previous PR we unified the existing Starlette and FastAPI custom serializers for numpy arrays. However, it is common for RLlib and other libraries to return a list of numpy scaler values:
[np.int(1), np.int(2)]. This PR adds support for that.Related issue number
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scripts/format.shto lint the changes in this PR.