Basic mouse and keyboard handling

Similar to the CSV viewer, there are tools we can enable to better handle the mouse and copy operations:

<img width="807" height="370" alt="Image" src="https://github.com/user-attachments/assets/336a9bf6-1699-4929-8eee-0c6ebf54e523" />

https://github.com/jupyterlab/jupyterlab/blob/19ccacf9079dce66e3672a3223b77c4ff574dbfb/packages/csvviewer/src/widget.ts#L264C1-L264C55