Feature Request: filter bar to re-filter & sort posts on-the-fly by taxonomy / date / other meta key values.

[slomeli79]

Know this is a big one, and may already be on the plan for the WPSP block in GB, but formally adding the request here.

Ideally, the site dev can create the initial query/loop, and specify which filters to expose to the user on the front-end. User could then choose one or more filters to apply (such as taxonomy =, <, > X, date >=< X, etc) and how to sort the resulting list/grid.