consider adding bars to supersearchfacet

[willkg]

We could support bars with supersearchfacet where there's just keys and values. Maybe we specify the columns to show and denote which to graph?

$ supersearchfacet --_facets=product --show-columns=product:text,count:graph
product
 product          | count  | graph
------------------|--------|------
 Firefox          | 379327 | ======================
 Fenix            | 345167 | =======================
 Thunderbird      | 106367 | =======
 Focus            | 6283   | =
 MozillaVPN       | 3      | =
 ReferenceBrowser | 1      | =
 --               | 0      | 
 total            | 837148 | =====================================================================

Or something like that?

Maybe use plotext? https://github.com/piccolomo/plotext

Maybe roll our own graphs? I've done this in the past.