[WIP] adding heat capacity and thermal conductivity as outputs for compressible

[Cristopher-Morales]

Proposed Changes

Adding heat capacity and thermal conductivity as outputs for the compressible solver in order to help the process of debugging inside SU2.

Related Work

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[pcarruscag]

Put them in a new group for now please.

[pcarruscag]

Add these after all the primitives were added. For solution that is a requirement otherwise we have issues with restarts. For primitives I don't think so but it would still be good to keep the convention.

[Hanquist]

@Cristopher-Morales would this also include thermal conductivity added surface outputs? This would help with issues such as #2438