chore: Memoize Floating UI options in TableHandlesController

[matthewlipski]

Summary

This PR adds memoization to Floating UI options in TableHandlesController.

Additionally, a bug has been fixed with the extend rows/columns buttons. If the mouse cursor would move from the table element to the button and started dragging it, the position would update ok. If the mouse cursor would move from outside the table element (i.e. from elsewhere in the table block) and started dragging it, the position would no longer update. This was because in the latter case, the extension state's rowIndex and colIndex would be undefined, and that incorrectly prevented the table reference element from being updated, which in turn prevented the button positions from updating.

Rationale

Minor code cleanup & useful bug fix.

Changes

N/A

Impact

N/A

Testing

Went through the UI testing doc to ensure no regressions & updated doc with new test case.

Screenshots/Video

N/A

Checklist

• Code follows the project's coding standards.
• Unit tests covering the new feature have been added.
• All existing tests pass.
• The documentation has been updated to reflect the new feature

Additional Notes

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commit: b891425

[YousefED]

looks good! Could you notice the memo missing? (i.e.: did it cause any errors or jankiness)?

[matthewlipski]

Not really tbh, just clears up the code a little and makes things more readable.