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### TL;DR For canvas elements, this PR adds placeholders during zooming operations to improve performance.  ### What changed? - Implemented placeholder rendering during zooming operations in the canvas renderer, but not only DOM. - Added a `forceFullRender` property to the `GfxCompatibleInterface` to allow elements to opt out of placeholder rendering - Set `forceFullRender = true` for connectors to ensure they always render properly, even during zooming - Connected the turbo renderer to the viewport's zooming state to automatically switch between full and placeholder rendering ### Why make this change? Rendering complex elements during zooming operations can cause performance issues and make the UI feel sluggish. Rendering connector label also leads to high cost DOM `set font` delays.  The turbo renderer improves performance by displaying simple placeholders for elements during zooming, while still rendering critical elements like connectors fully. This creates a smoother user experience while maintaining essential visual information. <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit - **New Features** - Introduced a feature-flag-controlled "turbo" rendering mode that displays placeholder graphics during zooming for improved performance. - Added the ability to override placeholder rendering for specific elements, ensuring full rendering when required. - **Bug Fixes** - Enhanced rendering logic to ensure connectors always render fully, even during zoom operations. - **Documentation** - Updated API documentation to reflect new properties related to rendering behavior. - **Tests** - Improved tests to verify correct rendering behavior for connectors. <!-- end of auto-generated comment: release notes by coderabbit.ai -->
