feat(copilot): sse mcp servers support

[ysfscream]

Based on the PR information provided, I'll complete the template with the relevant details:

PR Checklist

If you have any questions, you can refer to the Contributing Guide

What is the current behavior?

Currently, MQTTX only supports standard I/O transmission for MCP (MQTT Control Protocol).

Issue Number

(No specific issue number provided)

What is the new behavior?

Try to use this SSE Server: https://github.com/ysfscream/mqttx-mcp-sse-server

Added SSE (Server-Sent Events) support for MCP services. Now, users can enable MCP services simply by using a URL.

The screenshots show:

1. The new interface for MCP connection configuration with SSE support
2. The connection setup screen with the URL input option
3. The working MCP connection using SSE transport

Does this PR introduce a breaking change?

• No

Specific Instructions

To test this new feature:

1. Enter an SSE-enabled MCP server URL in the connection settings
2. The system will automatically use the SSE transport method for MCP services
3. This enhancement maintains backward compatibility with the existing studio transport method

Other information

This PR extends the transport protocol support for MCP in MQTTX by adding SSE transport capability alongside the existing studio support. The implementation is designed to be straightforward for users - they must provide the URL to enable MCP services via SSE.