feat: Add output schema support to MCP tools

[bigdevlarry]

The changes add comprehensive support for outputSchema in the Tools definition, enabling MCP servers to specify the expected structure and types of tool responses.

This includes:

Added outputSchema parameter to Builder::addTool() method
Updated the Tool class constructor and JSON serialization to support outputSchema
Added validation for outputSchema structure and type requirements
Enhanced existing tests to verify outputSchema functionality works correctly
Fixed related type annotation issues and code style problems

Motivation and Context

How Has This Been Tested?

Breaking Changes

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• [x ] I have added appropriate error handling
• I have added or updated documentation as needed

Additional context

[bigdevlarry]

Hi @chr-hertel, & @CodeWithKyrian the OutputSchema support PR is back up