Add the 386 field

[Jane Sandberg]

The new 386 is an interesting new field. At its best, it seems like it could enable some better search experiences for patrons, and the ability for collection development people to do diversity audits of their collections. At its worst, it seems like it could be inconsistent, inaccurate, or even privacy-violating in some pretty harmful ways.

I'm not sure how I feel about this field, obviously, but I do think that Evergreen should support it. Currently, 386 doesn't show up in the right-click menu in the MARC Editor, and the 386 also does not display in the OPAC.

LC documentation here: https://www.oclc.org/bibformats/en/3xx/386.html

[Kate Coleman (katecoleman)]

Confirmed in 3.1.10

While I have the same misgivings as Jane about the usage of this field, I agree that Evergreen should support it as a MARC field.