Remove need for onMove events

[snowystinger]

Closes

✅ Pull Request Checklist:

• Included link to corresponding React Spectrum GitHub Issue.
• Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• Filled out test instructions.
• Updated documentation (if it already exists for this component).
• Looked at the Accessibility Practices for this feature - Aria Practices

📝 Test Instructions:

To test this, the cursor should change in real-time as before. Indicating when you can resize in both directions or when you can resize only to the left or only to the right.
The cursor should only change for mouse, and should return to normal styles when keyboard is used to resize.
The blue line indicator of resizing should update as the resizing occurs and should also be on the currently resizing column.

🧢 Your Project:

[LFDanLu]

Seems to work well, confirmed that the resizer icon only appears when dragging with my mouse and not when using the keyboard. Also verified that the scrolling behavior when dragging past the edge of the table only happens when using keyboard and doesn't happen when resize is started via keyboard but then continued via mouse

[reidbarber]

LGTM