Add TemporaryGraphics wrapper and developer example bundle

[Wurschdhaud]

Description

Adds a new pyrevit.revit.tmpgfx helper module for managing Revit temporary in-canvas controls and click handlers.

• Adds ControlManager and Handler abstractions for DB.TemporaryGraphicsManager and UI.ITemporaryGraphicsHandler
• Adds a developer sample bundle under extensions/pyRevitDevTools.extension/.../TemporaryGraphics.pushbutton
• Includes a warning icon example and basic cleanup support

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Checklist

Before submitting your pull request, ensure the following requirements are met:

• Code follows the PEP 8 style guide.
• Code has been formatted with Black using the command:

  pipenv run black {source_file_or_directory}

• Changes are tested and verified to work as expected.

[Copilot]

Pull request overview

This PR introduces a new pyrevit.revit.tmpgfx helper module that wraps Revit’s TemporaryGraphicsManager and ITemporaryGraphicsHandler, plus a DevTools sample command demonstrating placing an in-canvas warning icon on a picked element and handling clicks.

Changes:

• Added pyrevit.revit.tmpgfx with Handler (service registration + click dispatch) and ControlManager (add/remove/clear/sync temporary in-canvas controls).
• Added a persistent-engine developer example bundle that places a warning icon control on a selected element and shows element info on click.
• Added a bundle config.py intended to clean up temp graphics/handlers for the persistent example.

Reviewed changes

Copilot reviewed 4 out of 6 changed files in this pull request and generated 4 comments.

File	Description
pyrevitlib/pyrevit/revit/tmpgfx.py	New wrapper module around TemporaryGraphics external service handler + per-view control management utilities
extensions/pyRevitDevTools.extension/pyRevitDev.tab/Developer Examples.panel/TemporaryGraphics.pushbutton/script.py	Developer sample placing a control and handling clicks via the new wrapper
extensions/pyRevitDevTools.extension/pyRevitDev.tab/Developer Examples.panel/TemporaryGraphics.pushbutton/config.py	Cleanup logic for the persistent example bundle
extensions/pyRevitDevTools.extension/pyRevitDev.tab/Developer Examples.panel/TemporaryGraphics.pushbutton/bundle.yaml	Declares title and persistent engine requirement for the sample

[Wurschdhaud]

Won't be able to fix the comments for the next 2-3 weeks. So I guess one for the next release