[BUU] Change unit number and unit display

[mariocarabotta]

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• on click show overlay with numeric field pre-selected
• if display unit is empty, show placeholder as {number}{unit scale abbreviation}
• if item is selected in unit scale, show placeholder as {number} {item label}
• "display unit as" optional field
• if "display unit as" is filled, once clicking outside, display it in the column (rather than the numeric value)

🎨 Design prototype: Units - Product List

[mariocarabotta]

estimate: 2 days

[dacook]

Estimate updated to 4 days.

I've done some more digging and discovered another feature in the current screen. I'll implement these technical requirements:

When product weight/volume/items is selected (variant_unit_with_scale):

1. Update hidden product fields variant_unit and variant_unit_scale based on dropdown selection (variant_unit_with_scale). See bulk_product_update_spec.js.coffee#L503
2. Variant display_as placeholder is updated by OptionValueNamer using onscreen variant/product data. See ofnDisplayAs

When a variant unit value is updated (unit_value_with_description):

1. Update hidden variant fields unit_value and unit_description from text field (unit_value_with_description). See bulk_product_update_spec.js.coffee#L564