feat(tools): Add debug tools

[CalvinAllen]

Description

Implement debug-related MCP tools to allow AI assistants to interact with the Visual Studio debugger.

Tools to Implement

• debug_start - Start debugging
• debug_stop - Stop debugging
• debug_pause - Pause execution
• debug_step_into - Step into
• debug_step_over - Step over
• debug_step_out - Step out
• debug_breakpoint_add - Add breakpoint
• debug_breakpoint_remove - Remove breakpoint
• debug_breakpoint_list - List breakpoints
• debug_locals - Get local variables
• debug_callstack - Get call stack

VS APIs

• DTE2.Debugger
• Debugger.Breakpoints
• Debugger.CurrentStackFrame