Whether the simsimd library can be changed to optional configuration

[oldpiao]

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simsimd cannot be installed properly on some older systems, and simsimd is not a necessary dependency in my opinion.

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After testing, I found that simsimd requires libc version 2.28+, and the centos version I use is only 2.17, and upgrading libc is too risky.

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After looking at the langchain-weaviate code, I see that the vector computation is only accelerated in _math.py, which appears on line 29.
Z = 1 - np.array(simsimd.cdist(X, Y, metric="cosine"))

In fact, this can be changed to an optional configuration, rather than a necessary configuration, so that the package is not available because simsimd is not installed.
For example:

try:
    import simsimd  # type: ignore
except ImportError:
    from scipy.spatial import distance as simsimd

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[hsm207]

I like this idea, just also add a logging message to inform user that simsimd lib is not found and will drop to numpy.

leaving this open for community contribution.