append reset functionality

[gauravharsha]

Modify reset function in timing for flexible operation inside and outside other active events.

[Copilot]

Pull Request Overview

This PR enhances the reset() functionality in the timing utility to support resetting all events when called at the root level. Previously, reset() would silently return when called at root level; now it resets all root events and their children.

• Added recursive reset_event_and_children() helper method to properly reset events and all descendants
• Modified reset() to reset all root events when called at root level (when _current_event is nullptr)
• Extended test coverage to verify root-level reset behavior

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/green/utils/timing.h	Added reset_event_and_children() helper method and updated reset() to handle root-level resets; updated documentation to reflect new behavior
test/utils_test.cpp	Added clarifying comments and test assertions to verify root-level reset functionality

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