feat(tools): add breakpoint enable/disable and conditional breakpoint support

[CalvinAllen]

Description

Add ability to enable/disable breakpoints and support conditional/hit count breakpoints.

Tools to Implement

Tool	Description
breakpoint_enable	Enable or disable a breakpoint at a specific file and line
Enhanced debugger_add_breakpoint	Support conditional expressions and hit count on breakpoints

Notes

• Extends existing debugger tools category
• Current breakpoint tools only support add/remove/list
• Competitor reference: Unofficial VS MCP Server by dhq-boiler