Better date range Facet + Widgets using JSON API

[DiegoPino]

Superseeds #443

Adds a complete new implementation for Date Facets using native gap + max/min processing from the obscured by search API (but fully functional) Facet JSON API Solr provides

[patdunlavey]

Hi @DiegoPino I see that the PR includes the chart.js library in the new "format_strawberryfield_facets" module. I wonder if you can describe what you have in mind for that? The reason I ask is because we've been asked to evaluate the feasibility of replicating the look and feel (and functionality) of of the date range widget seen on this Emory University site: https://digital.library.emory.edu/?range%5Byear_for_lux_isim%5D%5Bbegin%5D=1251&range%5Byear_for_lux_isim%5D%5Bend%5D=2024.

That widget comes from blacklight_range_limit.
The requirements that we have been given are:

1. It should have an "Apply" button. I.e. it should not auto-submit when the min or max limit changes.
2. Display a variable granularity histogram of dates in the results set.
3. Slider as well as min-max text fields.
4. Index granularity of years (finer granularity would, presumably, make things a LOT more complicated).

[DiegoPino]

@patdunlavey the new date range facet I am coding uses the chart.js (and tons of other things) to draw the frequency, but won't match visually the samvera one. It does match your requirements (except the granularity, it uses something more advanced) But this is part of the 1.5.0 release, so a month at least.

[patdunlavey]

That sounds great! Let me know if/how I can help.