Pivot middleware

[cyberbit]

Refactor targeted metrics by swapping their name and a chosen attribute (source, adapter, unit) or a custom static value. This would require a potential refactor allowing name to be a label.

For example:

backplane
  :addInput('storage', telem.input.refinedStorage('back'))
  :middleware(mw.pivot('unit'))

would produce something like

unit_item = 45 (name = minecraft:cobblestone)
unit_B = 3.12 (name = minecraft:lava)