Allow mxnet models to be used as a custom model

[ab93]

Summary

Allow users to use their custom tensorflow models and use them seamlessly as they would use numalogic's in-built models.

Use Cases

ML engineers and data scientists might want to use their own models written in tensorflow for inference.

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Message from the maintainers:

If you wish to see this enhancement implemented please add a 👍 reaction to this issue! We often sort issues this way to know what to prioritize.

[ab93]

Closing this because we plan to support only Pytorch models inside numalogic for the time being.