Update ToLLamaSharpChatHistory extension method to be public and support semantic-kernel author roles #274
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Currently when semantic-kernel ChatHistory is converted to LLamaSharp ChatHistory through the ToLLamaSharpChatHistory extension method in https:/SciSharp/LLamaSharp/blob/master/LLama.SemanticKernel/ExtensionMethods.cs the AuthorRole in the resulting LLamaSharp ChatHistory is set to AuthorRoles.Unknown as semantic-kernel uses lowercase author names while LLamaSharp capitalizes the first character. This PR tells the Enum.TryParse method to ignore letter case when matching.
Further, it exposes the ToLLamaSharpChatHistory extension method publicly since it would be useful for debugging in downstream applications.