feat: Add GitHub Copilot provider support

[Lixeer]

As feature reaquest #98

What pull reaquest finsh

• Add support. if you want to use ,you must download Copilot CLI and use command copilot --headless --port 4321 . link for details
• Only for grpc mode. I will finsh stdio one as soon as possible.
• Because of the SDK framwork(you can learn more about it), I order to implement the fullcontent ungracefully ungraceful

preview

func (p *GitHubCopilotProvider) Chat(ctx context.Context, messages []Message, tools []ToolDefinition, model string, options map[string]interface{}) (*LLMResponse, error) {
    type tempMessage struct {
        Role       string `json:"role"`
        Content    string `json:"content"`
    }
    out := make([]tempMessage, 0, len(messages))

    for _, msg := range messages {
        out = append(out, tempMessage{
            Role:       msg.Role,
            Content:    msg.Content,
        })
    }  

    fullcontent,_ := json.Marshal(out)
    // must join strings
    content,_ := p.session.Send(ctx,copilot.MessageOptions{
        Prompt: string(fullcontent),   
    })
     
    return &LLMResponse{
        FinishReason : "stop",
        Content:  content,
    }, nil
    
}

Finally:

• I found some problem with the current design, such as
  pkg/http_provider.go

func CreateProvider(cfg *config.Config) (LLMProvider, error) {
      //......
}

This a factory function for provider building. including, but not limited toHTTPProvider

config/config.go

type ProvidersConfig struct {
	Anthropic    ProviderConfig `json:"anthropic"`
	OpenAI       ProviderConfig `json:"openai"`
	OpenRouter   ProviderConfig `json:"openrouter"`
	Groq         ProviderConfig `json:"groq"`
	Zhipu        ProviderConfig `json:"zhipu"`
	VLLM         ProviderConfig `json:"vllm"`
	Gemini       ProviderConfig `json:"gemini"`
	Nvidia       ProviderConfig `json:"nvidia"`
	Moonshot     ProviderConfig `json:"moonshot"`
	ShengSuanYun ProviderConfig `json:"shengsuanyun"`
	DeepSeek     ProviderConfig `json:"deepseek"`
	GitHubCopilot ProviderConfig `json:"github_copilot"`
}

All of provider using same struct. The api_key,api_base just suit for http . We need to consider grpc ,stdio, pipline

[mengzhuo]

Thanks, please submit example config and update document.

[Orgmar]

@Lixeer GitHub Copilot provider的支持很赞！通过grpc模式对接Copilot CLI的方案挺巧妙的，给用户多了一个provider选择。

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