Add Together provider support to LangChain CLI

[HavenDV]

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Checklist

• Modify src/Cli/src/Providers.cs ✓ 8724d6b Edit
• Modify src/Cli/src/Commands/SummarizeCommand.cs ✓ 8724d6b Edit

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File Path	Proposed Changes
src/Cli/src/Providers.cs	Modify src/Cli/src/Providers.cs with contents: In the Providers class, add a new constant for the Together provider: ```csharp public const string TogetherAi = "togetherai"; ``` This will allow us to check for and use the Together provider in other parts of the CLI code.
src/Cli/src/Commands/SummarizeCommand.cs	Modify src/Cli/src/Commands/SummarizeCommand.cs with contents: In the SummarizeCommand class, modify the HandleAsync method to support the Together provider: First, add a new Option for specifying the provider: ```csharp var providerOption = new Option( aliases: ["--provider", "-p"], getDefaultValue: () => Providers.OpenAi, description: "Provider to use for summarization (default: OpenAI)"); AddOption(providerOption); ``` Then update the method signature to accept the provider option: ```csharp private static async Task HandleAsync(string input, string inputPath, string outputPath, int wordCount, string provider) ``` Inside the method, check if the Together provider is specified. If so, use the TogetherAiModel to generate the summary: ```csharp if (provider == Providers.TogetherAi) { var togetherAiProvider = new TogetherAiProvider(); var model = new TogetherAiModel(togetherAiProvider, TogetherAiModelIds.TogetherAiGpt3_5); outputText = await model.GenerateAsync( $""" Please summarize the the following text in {wordCount} words or less: {inputText} """); } else { outputText = await Helpers.GenerateUsingAuthenticatedModelAsync( $""" Please summarize the the following text in {wordCount} words or less: {inputText} """).ConfigureAwait(false); } ``` This checks if the provider argument equals the new `Providers.TogetherAi` constant. If so, it creates a `TogetherAiProvider` and `TogetherAiModel` to generate the summary. Otherwise, it falls back to the existing OpenAI provider logic. The `TogetherAiModel` constructor takes the provider instance and a `TogetherAiModelIds` enum value to specify which Together model to use.

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