refactor: moving connector label to connector view (#11738)

### Changed
Moved connector label moving logic from `default-tool` to connector view.

#### Other infrastructure changes:​​
- Gfx element view now can handles drag events
- Added `context.preventDefault()` support to bypass built-in interactions in extension
- Handle the pointer events in element view will bypass the built-in interactions automatically

> The built-in interactions include element dragging, click selection, drag-to-scale operations, etc.

blocksuite/framework/std/src/gfx/interactivity/event.ts

@@ -1,3 +1,5 @@
+import type { PointerEventState, UIEventState } from '../../event';
+
 export type SupportedEvents =
   | 'click'
   | 'dblclick'
@@ -5,4 +7,42 @@ export type SupportedEvents =
   | 'pointerenter'
   | 'pointerleave'
   | 'pointermove'
-  | 'pointerup';
+  | 'pointerup'
+  | 'dragstart'
+  | 'dragmove'
+  | 'dragend';
+
+export type GfxInteractivityContext<
+  EventState extends UIEventState = PointerEventState,
+  RawEvent extends Event = EventState['event'],
+> = {
+  event: EventState;
+
+  /**
+   * The raw dom event.
+   */
+  raw: RawEvent;
+
+  /**
+   * Prevent the default gfx interaction
+   */
+  preventDefault: () => void;
+};
+
+export const createInteractionContext = (event: PointerEventState) => {
+  let preventDefaultState = false;
+
+  return {
+    context: {
+      event,
+      raw: event.raw,
+      preventDefault: () => {
+        preventDefaultState = true;
+        event.raw.preventDefault();
+      },
+    },
+    get preventDefaultState() {
+      return preventDefaultState;
+    },
+  };
+};