[.Net][Feature Request]: Consume SK Plugins in Agent

[LittleLittleCloud]

Is your feature request related to a problem? Please describe.

semantic kernel allows user to use plugins to extend the ability of llm. In the meantime, semantic kernel also provides a lot of built-in plugins, like OpenAPI or BingSearch. It would greatly extend the ability of agents if those plugins can also be used in agent, in the similar way of tool call.

Describe the solution you'd like

We can provide a middleware in AutoGen.SemanticKernel to consume plugins

var getWeatherMethod = kernel.CreateFunctionFromMethod((string location) => $"The weather in {location} is sunny.", functionName: "GetWeather", description: "Get the weather for a location.");
        var createPersonObjectMethod = kernel.CreateFunctionFromMethod((string name, string email, int age) => new Person(name, email, age), functionName: "CreatePersonObject", description: "Creates a person object.");
var plugin = kernel.ImportPluginFromFunctions("plugin", [getWeatherMethod, createPersonObjectMethod]);
var kernelFunctionMiddleware = new KernelPluginMiddleware(kernel, plugin);

var agent = new OpenAIChatAgent(openaiClient, "assistant", modelName: "gpt-35-turbo-16k")
            .RegisterMessageConnector()
            .RegisterMiddleware(kernelFunctionMiddleware);

var reply = await agent.SendAsync("what's the weather in Seattle?");
reply.GetContent().Should().Be("The weather in Seattle is sunny.");

Additional context

No response

Tasks

Beta Give feedback

1. Add plugin middleware [.Net] Add KernelPluginMiddleware in AutoGen.SemanticKernel #2595
2. [.Net] [Feature Request] Add document and examples for consuming SK plugins in AutoGen.Net #2653
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