Add more enum values to ConfigureResolveAutoInertials

[scpeters]

Desired behavior

From #1335 (comment):

Regarding //inertial/@auto, the behavior was supposed to be determined by ConfigureResolveAutoInertials, but I don't think it's working correctly because it's exporting all inertia values unconditionally.

I think the logic should be the following in pseudocode

auto==true && SAVE_CALCULATION:
  export all inertia
auto==true && not SAVE_CALCULATION:
 export `//inertial/auto`

But it looks like we need more enum values for "skip calculation during load and do not save calculation" and "calculate during load but do not save calculation".

Alternatives considered

Implementation suggestion

Additional context