Rails Class Autoloading/Eagerloading Support

[patvice]

Hey! Though I would through this together based on some work I did integrating FastMcp into a Rails project.

This PR mains to improve some of the rails integration:

• Only define ActionTool and ActionResource when rails is defined (Reason for ActionTool and ActionResource top-level classes #58)
• Setup confirmation for tool directory and resource directory
• Eager load all classes in tool directory and resource directory to be able to add them to the server
• Support Server being able to reset both registered tools and registered resource
• Support rails style code reloading for tools and resources (Issue with Class reloading in Rails #93)
• Support auto registering classes that inherit from ApplicationTool and ApplicationResource.

[spikex]

I like this solution to reloading. Any plans to merge it?