[EDITORIAL] Reclassify ConsumedUnit as Dimension instead of Metric (#506

)

Correct ConsumedUnit column type to Dimension from Metric (similar to
PricingUnit) because it is an attribute of how the consumption is
measured and is not able to have mathematical operations applied to it.

specification/columns/consumedunit.md

@@ -20,7 +20,7 @@ Provider-specified measurement unit indicating how a provider measures usage of
 
 |    Constraint   |      Value      |
 |:----------------|:----------------|
-| Column type     | Metric          |
+| Column type     | Dimension       |
 | Feature level   | Conditional     |
 | Allows nulls    | True            |
 | Data type       | String          |