[Enhancement] Add Fin-Eval into OpenCompass

[tonysy]

Hi, thanks for the great works.

This is OpenCompass Team.

Welcome to update the Fin-Eval into OpenCompass. We can update the leaderboard with Fin-Eval in the future once the the Fin-Eval is supported by the OpenCompass.

We believe the OpenCompass is helpful for improving the usage of Fin-Eval in research community.

Docs: https://opencompass.readthedocs.io/en/latest/advanced_guides/new_dataset.html
Examples:

• [Feature] Add CMMLU dataset open-compass/opencompass#91
• [Feature] Add TydiQA-goldp task open-compass/opencompass#75

If you need more help, feel free to raise an issue in OpenCompass