docs: update documentation for RunnableWithMessageHistory

[ccurme]

• Description: Update documentation for RunnableWithMessageHistory
• Issue: Doc: Improve Documentation for RunnableWithMessageHistory #16642

I don't have access to an Anthropic API key so I updated things to use OpenAI. Let me know if you'd prefer another provider.

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Name	Status	Preview	Comments	Updated (UTC)
langchain	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 15, 2024 11:55pm

[eyurtsev]

Awesome!

Two things small comments:

1. The high level orgnaization focuses on in memory vs. persistent storage:

Could we update the headers to highlight the API more prominently.

Users will likely be looking at this to figure out how to wrap a runnable and understand the API, and only afterwards worry about which storage to use (memory vs. redis etc.)

2. Would you mind showing off an example with streaming? (I think you could throw in a sleep into the store itself when doing add_messages to show that streaming will not be blocked.)

[eyurtsev]

Going to merge existing changes, can follow up if you'd like with changes suggested by comment!