Add Retrieval Augmented Generation evaluation features.

[muazhari]

Adding an evaluation system other than BEIR, like KILT: https://ai.facebook.com/tools/kilt/ or ALCE: https://arxiv.org/abs/2305.14627, could be useful. I need this to evaluate my LFQA/RAG/Re2G application. And, these RAG things are currently in hot time that you should not miss the care, I think.

[ZanSara]

Hey @muazhari, thank you for the feature request! I'll convert it into an issue. In the meantime, if you want to contribute we'll be happy to help you along! 😊