Llama Index integration for UpTrain

[sourabhagr]

The idea is to provide a single-line integration for anyone using Llama Index to be able to evaluate their LLM applications using UpTrain - especially relevant for checks used for evaluating RAG pipelines

[sourabhagr]

Thanks @Dominastorm for completing this. PR: run-llama/llama_index#10432

Let's also update UpTrain docs and add a tutorial for this

[Dhruv Chawla]

Completed