Add Together provider support to LangChain CLI

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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<string>( 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 theproviderargument equals the newProviders.TogetherAiconstant. If so, it creates aTogetherAiProviderandTogetherAiModelto generate the summary. Otherwise, it falls back to the existing OpenAI provider logic. TheTogetherAiModelconstructor takes the provider instance and aTogetherAiModelIds` enum value to specify which Together model to use.

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<br/>var providerOption = new Option<string>(<br/> aliases: ["--provider", "-p"], <br/> getDefaultValue: () => Providers.OpenAi,<br/> description: "Provider to use for summarization (default: OpenAI)");<br/><br/>AddOption(providerOption);<br/>\```<br/><br/>Then update the method signature to accept the provider option:<br/><br/>\```csharp <br/>private static async Task HandleAsync(string input, string inputPath, string outputPath, int wordCount, string provider) <br/>\```<br/><br/>Inside the method, check if the Together provider is specified. If so, use the TogetherAiModel to generate the summary:<br/><br/>\```csharp<br/>if (provider == Providers.TogetherAi)<br/>{<br/> var togetherAiProvider = new TogetherAiProvider();<br/> var model = new TogetherAiModel(togetherAiProvider, TogetherAiModelIds.TogetherAiGpt3_5);<br/> <br/> outputText = await model.GenerateAsync(<br/> $"""<br/> Please summarize the the following text in {wordCount} words or less:<br/> {inputText}<br/> """);<br/>}<br/>else <br/>{<br/> outputText = await Helpers.GenerateUsingAuthenticatedModelAsync(<br/> $"""<br/> Please summarize the the following text in {wordCount} words or less:<br/> {inputText}<br/> """).ConfigureAwait(false);<br/>}<br/>\```<br/><br/>This checks if theprovider`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.<br/><br/>The`TogetherAiModel`constructor takes the provider instance and a`TogetherAiModelIds` enum value to specify which Together model to use.

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tryAGI / LangChain

Add Together provider support to LangChain CLI #238

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