refactor: redesign element transform manager interface (#11679)

### Change
- Rename `ElementTransformManager` -> `InteractivityManager`
- Now you can `event.on` and `action.onXXX` method to extend interactivity behaviour. The old approach of overriding methods directly is deprecated.

blocksuite/framework/std/src/gfx/index.ts

@@ -12,29 +12,26 @@ export {
 } from '../utils/tree.js';
 export { GfxController } from './controller.js';
 export type { CursorType, StandardCursor } from './cursor.js';
-export type {
-  DragExtensionInitializeContext,
-  DragInitializationOption,
-  ExtensionDragEndContext,
-  ExtensionDragMoveContext,
-  ExtensionDragStartContext,
-} from './element-transform/drag.js';
-export { CanvasEventHandler } from './element-transform/extension/canvas-event-handler.js';
-export {
-  ElementTransformManager,
-  TransformExtension,
-  TransformExtensionIdentifier,
-  TransformManagerIdentifier,
-} from './element-transform/transform-manager.js';
-export type {
-  DragEndContext,
-  DragMoveContext,
-  DragStartContext,
-} from './element-transform/view-transform.js';
-export { type SelectedContext } from './element-transform/view-transform.js';
 export { GfxExtension, GfxExtensionIdentifier } from './extension.js';
 export { GridManager } from './grid.js';
 export { GfxControllerIdentifier } from './identifiers.js';
+export type {
+  DragEndContext,
+  DragExtensionInitializeContext,
+  DragInitializationOption,
+  DragMoveContext,
+  DragStartContext,
+  ExtensionDragEndContext,
+  ExtensionDragMoveContext,
+  ExtensionDragStartContext,
+  SelectedContext,
+} from './interactivity/index.js';
+export {
+  GfxViewEventManager,
+  InteractivityExtension,
+  InteractivityIdentifier,
+  InteractivityManager,
+} from './interactivity/index.js';
 export { LayerManager, type ReorderingDirection } from './layer.js';
 export type {
   GfxCompatibleInterface,