StoreFilterField default behavior does not mesh well with ZoneGrid

[amcclain]

When bound to a GridModel, SFF defaults to only including visible columns in its search:

hoist-react/cmp/store/impl/StoreFilterFieldImplModel.ts

Line 164 in 8f97a34

if (gridModel) {

This is a good default for normal grids, but does not play well with ZoneGrid, where the visible leaf columns do not directly relate to visible fields. You can see the poor result in our Toolbox mobile ZoneGrid example, which has a SFF configured. (Same problem would manifest on desktop, we just don't have a handy example there.)

I believe we want to be able to bind SFF to a ZonedGridModel and have it adjust its handling accordingly. (This would also avoid the awkwardness you see in the TB example of having to manually bind SFF to model.zoneGridModel.gridModel - which itself is a bit of a hint that something isn't quite ideal)