Add utility class for dynamic MCP stdio connections

[baekgol]

Overview

This PR adds a new utility class McpClientStdioUtils that enables dynamic creation and management of MCP client connections at runtime using stdio transport. This functionality allows applications to add new MCP connections without relying solely on configuration properties.

Changes

• Added McpClientStdioUtils class with:
  • Support for both synchronous and asynchronous MCP client creation
  • Consistent configuration using common properties
  • Runtime connection management methods
  • Comprehensive Javadoc documentation

Use Cases

• Dynamic management of MCP connections without application restart
• Programmatic addition of connections from user input or configuration
• Runtime integration with newly discovered MCP servers

[markpollack]

@baekgol There is just one class, with all private static methods. It does not seem to address the functionality mentioned in the description. Can you please elaborate?