Support disabling a breakpoint

[Copilot]

This PR implements the ability to enable and disable breakpoints in the debugger, addressing the need for better breakpoint management during debugging sessions.

Changes Made

Core Functionality

• Added EnableBreakpoint() and DisableBreakpoint() methods to the DebuggerController API for both absolute addresses and module+offset breakpoints
• Implemented enabled state tracking in the DebuggerBreakpoints class using an internal map to persist enable/disable state
• Added corresponding FFI functions (BNDebuggerEnableAbsoluteBreakpoint, BNDebuggerDisableAbsoluteBreakpoint, etc.)
• Extended the event system with new event types for breakpoint enable/disable operations
• Updated BNDebuggerGetBreakpoints() to return the correct enabled state instead of hardcoded false

UI Enhancements

• Enabled Column: Restored and implemented the previously commented-out enabled column in the breakpoints list, displaying ☑/☐ checkboxes
• Interactive Toggle: Added mouse click support - users can click directly on the enabled column to toggle individual breakpoints
• Context Menu Actions: Added "Enable Breakpoint", "Disable Breakpoint", and "Toggle Breakpoint Enable/Disable" options
• Keyboard Shortcut: Implemented Ctrl+Shift+B hotkey for toggling selected breakpoints
• Multi-selection Support: All enable/disable operations work on multiple selected breakpoints

Behavior

• Breakpoints are enabled by default when created
• Disabling a breakpoint removes it from the target debugger but keeps it in the breakpoints list
• Enabling a disabled breakpoint re-adds it to the target debugger
• The enabled state persists across debugging sessions through the existing metadata serialization

Example Usage

Users can now:

1. Right-click on breakpoints in the list to enable/disable them
2. Click directly on the enabled column (☑/☐) to toggle individual breakpoints
3. Select multiple breakpoints and use Ctrl+Shift+B to toggle them all
4. Use context menu for fine-grained control over breakpoint states

This provides much better workflow for debugging scenarios where you want to temporarily disable certain breakpoints without losing them entirely.

Fixes #318.

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[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}