[PROBLEM] Update broken usage of llama_index usage.

[dingkwang]

[optional format]

Identify the file to be fixed
Those scripts use llama-index.
examples/evaluation/Evaluate_RAG_with_LlamaIndex.ipynb
examples/third_party/financial_document_analysis_with_llamaindex.ipynb
And other scripts using llama_index.

Describe the problem
The llama_index version is not specified. Many module imports and usage are deprecated once the user installs the latest llama_index version.

Describe a solution
Specific to the llama_index installation version and update the usages.

Additional context
Llama_index is a very popular and powerful production agent and many people refer to its example usage. Good maintenance is beneficial.

[dingkwang]

PR is up for how to use the latest llama-index.
#1615