give accessorFn access to row and table

[wbolduc]

This is half a feature request and half a typing question

With the addition of _features recently I've been able to add row and table to the accessor function as follows

_features: [
	{
		createRow: (row, table) => {
			row.getValue = (columnId) => {
				if (row._valuesCache.hasOwnProperty(columnId)) {
					return row._valuesCache[columnId];
				}

				const column = table.getColumn(columnId);

				if (!column?.accessorFn) {
					return undefined;
				}

				row._valuesCache[columnId] = column.accessorFn(
					row.original,
					row.index,
					row,
					table
				);

				return row._valuesCache[columnId] as any;
			};
		},
	},
]

The usecase for this is to use the built-in caching system to accumulate values of filtered children rows.

helper.accessor(
	(original, index, row, table) => {
		const { subRows } = row;

		if (subRows.length === 0) return 1;
		return sumBy(row.subRows, (row) => row.getValue("sums"));
	},
	{
		id: "sums",
	}
)

Toy implementation works

I want to do it like this because I want to know the sums based on the current filtering. Creating the sums externally doesn't work with the filters

Questions

1. Is it maybe worth adding these values to the accessor by default?
2. How do I type this. You're able to extend definitions for interfaces but this is a function. Do I just need to branch off?