Reduce size of Instant Results dependencies

[JakePT]

Is your enhancement related to a problem? Please describe.
As raised on #2756 Instant Results uses a couple of @wordpress packages that are quite large and could be substituted by smaller alternatives.

In particular @wordpress/date is used for displaying result dates, but is a large package that depends on Moment.js, another large package. Also, SlotFills from @wordpress/components is used for active Facet chips, bringing along the whole library, but could be replaced with a manual custom Portals implementation.

Describe the solution you'd like
Replace the large package dependencies with custom or smaller alternatives.