feat: Add colspan to Table (#7638)
* Add colSpan support to table cells
* Add aria-col-index to cells
* Don't set colspan in useGridCell
* Add colspan and colindex in collections
* Add colspan unit tests
* Add check to validate that cells total length match col length to react-aria-components
* Don't throw when isSSR
* Remove interfering test
* Re-add throwing tests
* Add check to validate number of cells match col length in GridCollection
* Rename colspan to colSpan
* Move colSpan prop down to useGridCell
* remove unneeded prop assignments
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Co-authored-by: Robert Snow <rsnow@adobe.com>
Co-authored-by: GitHub <snowystinger@gmail.com>
