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This PR adds `Plugin::on_widget_under_pointer` which gets called whenever a widget is created whose rect contains the pointer. The point of the hook is to capture a stack trace which can be used to map widgets to their corresponding source code so it must be called while the widget is being created. The obvious concern is performance impact. However, since it's only called for rects under the cursor, the effect seems negligible afaict. It's under `debug_assertions` just in case. This change is needed so we can publish the widget inspector we've been working on. Basically a plugin that allows us to jump from any widget back to their corresponding source code. This video shows the plugin configured to open the corresponding code in github, but normally it would open your local editor. Update: [Live demo](https://membrane-io.github.io/egui/) (Firefox/Safari not yet supported. `Cmd-I` to inspect. `Tab` to cycle filters. `Click` to open). It will try to open a file under `/home/runner/work/egui/egui/` so it won't work, but you get the idea. https://github.com/user-attachments/assets/afe4d6af-7f67-44b5-be25-44f7564d9a3a ## What's next After this gets merged I plan to publish the above plugin as its own crate, that way we can iterate and release quickly while things are still changing. I agree it would make sense to eventually merge it into the main egui repo (like @emilk suggested in #4650). * [x] I have followed the instructions in the PR template --------- Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>