Migrate Llama-Index Optional Dependency to 0.10

[joshreini1]

Solution proposed by Logan is to use a bridge file for imports, similar to what they did with pydantic, to maintain compatibility across llama-index versions

In the meantime, we've pinned the llama-index optional requirement to <0.10.

Note, that this is only an issue if your app uses llama-index >= 0.10. Llama-index is not a required TruLens dependency

[joshreini1]

This is released in 0.24.0!