Commits on Oct 14, 2024

1. refactor(edgeless): element tree manager (#8239) …

   ### TL;DR
   This PR introduces `TreeManager` to maintain the container-children relationship among `GfxModel`s. This change can make sure an element only has zero or one container.
   
   ### What changes:
   - A new `TreeManager` is introduced to maintain the container-children relationship.  Its implementation references the relevant code previously used in group in `surface-model.ts`.
   - Removed code related to the container-children relationship watcher of group.
   - The `ContainerElement` interface and related code have been moved from `element-model.ts` to a new file, `container-element.ts`.
   - Simplified the implementation of the `ContainerElement` interface in `GroupLikeModel` and `FrameModel`.
   - Some type annotation changes: from `BlockSuite.EdgelessModel` to `GfxModel`.
   
   ### About test:
   The existing tests already cover the changes mentioned above, including the relationship changes after operations on the child elements of frames and groups.

   

   L-Sun committed Oct 14, 2024
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