Order of UnitInfos in static constructors does not match enum values in-order.

[tmilnthorp]

Describe the bug
The order of UnitInfo registration in static constructors does not (always) match enum values in-order. This makes trying to retrieve a UnitInfo by index (of the enum value) impossible.

To Reproduce
Steps to reproduce the behavior (just an example):

1. Look at static Length()
2. Megameter (value 41) is the 20th index in the array.

Expected behavior
How can we retrieve a UnitInfo based on a unit enum value? We may need to move to a Dictionary.

Additional context
This is especially applicable as I work through #1210, trying to get the abbreviations based on an enum value.

[tmilnthorp]

Ah. I just found Quantity.GetUnitInfo.

Kinda hidden. TODO: Improve discoverability.

[tmilnthorp]

Also a todo: this loads all quantity infos as one. We can do lazily if we use methods rather than exposing the raw array storage.

[stale]

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