Add rerankers to the list of supported models (Supported_Models.ipynb)

[paulmartrencharpro]

Reranker models are not listed on https://qdrant.github.io/fastembed/examples/Supported_Models/

I added them at the end. I had to add TextCrossEncoder to fastembed/init.py. I don't know if that's the best way to do this

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[joein]

Hi @paulmartrencharpro

Thank you for the contribution! I updated it a little bit, so we could keep the imports as is