[Suggestion] Switch to the new JEI workbench display format

[chmonyasik]

Starting with JEI 19.54.0.427 (1.21.1),
JEI introduced functionality for grouping workbenches, which could help make the display of Spectrum workbenches cleaner and more pleasant.

mezz/JustEnoughItems@637efbd#diff-f004f4fe15a2d5d275d53b42221429e8bbcac9620f36bcc326e5f319f22b7a7d

Maybe also a general JEI support? Know there's already an addon called SpectrumJEI 🤔