.NET: Add helpers to more easily access in-memory ChatHistory and make ChatHistoryProvider management more configurable.#4224

westey-m wants to merge 4 commits intomicrosoft:mainmicrosoft/agent-framework:mainfrom

westey-m:message-access-and-chathistoryprovider-managementwestey-m/agent-framework:message-access-and-chathistoryprovider-managementCopy head branch name to clipboard