Add support for search tools and dynamic tool loading

[adwsingh]

Issue #, if available:

Description of changes:

Add support for search tools and dynamic tool loading

This PR enhances the MCP server implementation with dynamic tool discovery and installation capabilities:

Key Changes

• Search Tools API: Added searchTools operation to the registry service that allows finding relevant tools based on task descriptions
• Dynamic Tool Installation: Implemented installTool operation to dynamically install MCP tools at runtime
• Tool Filtering: Added configurable tool filtering support with predicate-based filtering
• Server Architecture Updates:
  • Services now stored in a map structure for better management
  • Added support for both Smithy-modeled and generic MCP tool bundles
  • Enhanced proxy server initialization and tool refresh mechanisms
• Registry Model Updates: Updated the registry schema to support tool search and installation workflows
• CLI Enhancements: Updated StartServer command to handle dynamic tool loading and registry operations

API Changes

• Replaced ListServers/InstallServer operations with SearchTools/InstallTool
• Added RegistryTool record for tool identification
• Enhanced InitializeResult to include optional instructions field

Implementation Details

• Tools can now be installed on-demand from the registry
• Supports both direct service integration and proxy-based tool execution
• Maintains backward compatibility with existing tool bundle configurations
• Added proper error handling and validation for tool installation

This enables a more flexible and discoverable tool ecosystem where clients can search for and install relevant tools based on their current tasks.

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