Workup Order

[bdeadman]

Is your feature request related to a problem? Please describe.
For the input additions we have addition order, but in workups it is only implied by the order they are recorded.

Describe the solution you'd like
Have a workup order field in workups. This would remove ambiguity, and allow workup steps to be re-ordered.

[connorcoley]

Would you want workups to no longer be a repeated field with a strict sequential order, and instead be a map like inputs are?

[qai222]

Maybe just add an additional workup_order field to ReactionWorkup, like addition_order to ReactionInput?