Bib detector entity like output

[geli-gel]

for allenai/scholar#36565 Removes span boxes from bib_entry SpanGroups, and turns raw_bib_entry_boxes from BoxGroups into SpanGroups (with no spans because we just care about saving the boxes here, and calling .annotate with the original box_groups is not necessary).

tt verify -c src/ai2_internal/config.yaml -v bibentry_detection_predictor passes

todo:

• [x] publish new mmda version
• [x] add it to timo-services config
• [x] see if SPP is happy with it
• [x] it's not -- make it happy with it try number 2: https://github.com/allenai/timo/pull/183