Add filtering to the table

[geoffreylitt]

In previous iterations of Wildcard we used the stock Handsontable Filter plugin to directly sort and filter the data table.

Now Handsontable is no longer responsible for sorting/filtering the table directly. We do it in the Wildcard code.

Sorting has already been moved to such an implementation. See https://github.com/geoffreylitt/wildcard/blob/main/src/ui/WcPanel.tsx#L169

Now we need to do the same for filtering, using Handsontable's beforeFilter hook.