Ability to make requests with existing history

I am looking through the C# SDK and there doesn't seem to be a way to create a new session with existing history? Are there plans to add such an option?

Start by inspecting the C# SDK's session-creation entry point and how session history is represented. Determine whether a new session can accept existing history, then clarify the intended option and add coverage for creating a session with prior history.

Written by the indexing model from the issue text.