Reconsider LC/SC decoupling

[skliper]

Checklist (Please check before submitting)

• [x] I reviewed the Contributing Guide.
• [x] I reviewed the README file to see if the feature is in the major future work.
• [x] I performed a cursory search to see if the feature request is relevant, not redundant, nor in conflict with other tickets.

Is your feature request related to a problem? Please describe. Split off from #99 to better focus bug fix vs higher level design concepts.

There's local dfns of SC owned elements, which is a maintenance issue. https://github.com/nasa/LC/blob/ca4767089966c6ba5b308fa42272763a6881c192/config/default_lc_interface_cfg.h#L40-L60 https://github.com/nasa/LC/blob/ca4767089966c6ba5b308fa42272763a6881c192/config/default_lc_interface_cfg.h#L62-L78 https://github.com/nasa/LC/blob/ca4767089966c6ba5b308fa42272763a6881c192/config/default_lc_msgstruct.h#L228-L254

Describe the solution you'd like LC depends on SC as designed, recommend single source of truth.

Describe alternatives you've considered None

Additional context Review functional testing to confirm this dependency is sufficiently tested.

Requester Info Jacob Hageman - NASA/GSFC

[jphickey]

Definitely agree, LC should not be redefining these structs, it should be using the definitions from SC if it needs them.