[TableCell] Enable size prop overrides via module augmentation

[brentertz]

Enable TableCell size prop overrides via module augmentation using pattern recommend in #33802 (comment).

Fixes #33802

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[mui-bot]

No bundle size changes

Generated by 🚫 dangerJS against faa0d84

[siriwatknp]

👍 Thanks for your first contribution!

[ZeeshanTamboli]

We also need to update the size prop type in TableCell. Here is an example of how it should be:

material-ui/packages/mui-material/src/Table/Table.js

Lines 118 to 121 in a804ca8

	size: PropTypes /* @typescript-to-proptypes-ignore */.oneOfType([
	PropTypes.oneOf(['medium', 'small']),
	PropTypes.string,
	]),

Then update the API docs.