Add support for Swift GRB FAR

In support of: !32

Ingests a 'FAR' field in Hz and adds it to the event data model. If
the field is present, then show it in the GRB event table on the
detail page.
2 jobs for gracedb-2.8.2 in 16 minutes and 57 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Test
passed #639798
test:3.5

00:12:26

73.0%
 
  Branch
passed #639799
branch_image

00:04:31