chore: add imgui widgets

[!CAUTION]

Review failed

The pull request is closed.

Walkthrough

The pull request introduces enhancements to the GUI components of the editor within the imgui-demo package. Key changes include the addition of the target property in the Editor class, improved handling of component properties in the VFXItemInspector, and the introduction of the EditorGUILayout class for streamlined GUI element creation. The modifications allow for better interaction with various property types, including numeric, boolean, vector, and color properties, as well as support for drag-and-drop functionality for loading effects and materials.

Changes

File Path	Change Summary
`web-packages/imgui-demo/src/custom-editors/editor.ts`	Added property `target: object` in `Editor` class; enhanced `onInspectorGUI` for various property types and drag-and-drop functionality for effects and materials.
`web-packages/imgui-demo/src/object-inspectors/vfx-item-inspector.ts`	Streamlined imports; modified `onGUI` method to utilize `EditorGUILayout` for rendering; added `private defaultComponentEditor` in `VFXItemInspector`.
`web-packages/imgui-demo/src/widgets/editor-gui-layout.ts`	Introduced `EditorGUILayout` class with static methods for rendering GUI elements; added `alignWidth` property for consistent alignment.

Poem

🐰 In the editor's realm, changes abound,
With new layouts and features, joy is found.
Drag and drop, colors that gleam,
A GUI that dances, like a sweet dream.
So hop along, let creativity flow,
In this vibrant world, let your ideas grow! 🌼✨

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galacean / effects-runtime