Add callback for Table CellResizer

[vinguyen12]

Add callback for Table CellResizer similar to other TableEditFeature.

With this, client will have more control over how they can define the resizer component and action.

[JiuqingSong]

question, what do we want to do with this callback?

[vinguyen12]

question, what do we want to do with this callback?

This callback gives us access to the CellResizer handler component, so we can use it for applying the wanted z-index there (similar to what we're doing for other components of TableResizer and TableInserter)

[Copilot]

Pull Request Overview

This PR adds callback functionality to the Table CellResizer feature to provide clients with more control over resizer component definition and actions, bringing consistency with other TableEditFeature implementations.

• Added OnTableEditorCreatedCallback parameter to createCellResizer function
• Created a new CellResizer class that extends DragAndDropHelper to handle the callback lifecycle
• Updated TableEditor to pass the callback to both horizontal and vertical cell resizers

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
CellResizer.ts	Added callback parameter and created CellResizer class with proper disposal handling
TableEditor.ts	Updated calls to createCellResizer to include the onTableEditorCreated callback

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