Support adding MCP servers by uploading an `claude_desktop_config.json`-like file`

[fedirz]

Here's the format for the MCP server configuration in JSON:

{
  "mcpServers": {
    "todoist": {
      "command": "xxx",
      "args": ["-y", "@abhiz123/todoist-mcp-server"],
      "env": {
        "TODOIST_API_TOKEN": "xxx",
        "PATH": "xxx"
      }
    }
  }
}

NOTE: command and args won't be supported as those properties are for STDIO servers. Only properties for SSE servers will be supported.