[feature request] Add an easy way to get the root span from a child span

[omrihar]

Is your feature request related to a problem? Please describe.
I want to implement a feedback sending mechanism from the front-end of a chat bot to a python backend.
For LangChain, it is possible to add a link in the chain that fetches the current span_id using from openinference.instrumentation.langchain import get_current_span, but this only gives the span_id of that link.
It is much more natural to get the root span id, which is the correct one to annotate with the user-sent feedback, but it's currently not easy to accomplish programmatically. See discussion here: Arize-ai/phoenix#4800

Describe the solution you'd like
An easy to use mechanism to get the root span_id of the currently running trace, ideally in a way that is agnostic to the currently instrumented LLM framework solution, but also a specific one for each framework would be nice.

Describe alternatives you've considered
I've considered creating the root span manually and then calling a chain within that with the automatically instrumented langchain, but that is very inelegant.

[anticorrelator]

thank you for the request @omrihar! I'll start investigating some strategies and get back to you