[Bug]: IndexParams type required by create_index() but not exposed in public API

[nvonpentz]

Is there an existing issue for this?

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Describe the bug

The MilvusClient.create_index() method expects an IndexParams type, but this type isn't exposed in the public API.

The create_index signature requires it.

    def create_index(
        self,
        collection_name: str,
        index_params: IndexParams,
        timeout: Optional[float] = None,
        **kwargs,
    ):

But I can't import this type.

>>> from pymilvus import IndexParams
ImportError: cannot import name 'IndexParams' from 'pymilvus'
>>> from pymilvus.index import IndexParams  
ModuleNotFoundError: No module named 'pymilvus.index'

Expected Behavior

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Steps/Code To Reproduce behavior

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Environment details

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Anything else?

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