Godot - Fix Observable Tracker stability & Enhance UX (Hide Ops, Simple Trace, Jump to Source)

[JhMaic]

This PR resolves a critical NullReferenceException that caused the Observable Tracker to fail immediately upon startup/enabling #357 ; #334. It also significantly upgrades the tracker with new filtering capabilities and navigation support.

Note: These changes have been tested on Godot 4.5.1.

🐛 Fixes

• Fixed Startup & Hot Reload Instability: Resolved the NullReferenceException that occurred when enabling the plugin or starting a session. The Tracker now initializes correctly and remains stable across Assembly Reloads (Hot Reload).
• Fixed Ghost Instances: Implemented a check to prevent duplicate DebuggerPlugin instances from accumulating and spamming logs.

✨ New Features

• Toggle: Hide Ops: Added a checkbox to filter out intermediate operators (e.g., Where, Select), keeping only ReactiveProperty and Subscribe events for a cleaner view.
• Toggle: Simple Trace: Added a checkbox to hide internal stack frames from Godot, R3, and System.Reactive, allowing the view to focus solely on user scripts.
• Jump to Source: Double-clicking on the StackTrace column now automatically opens the specific script file and line number in the external editor.

🎨 Changes

• Column Update: Changed the "Elapsed" column (relative duration) to "Created At" (absolute local time) to make it easier to correlate events with console logs.
• Performance: Added a maximum item limit (1000 items) to the list to prevent editor freezing when tracking high-frequency observables.

[BaronKiko]

Works well for me, thanks. Hopefully this one actually gets merged