Write compact restart files

[bigfooted]

Proposed Changes

We aim to implement 2 things:

1. Restart files contain variables that are not necessary for restarts. with the keyword WRT_RESTART_COMPACT= YES we can write compact restart files containing only necessary fields.

2. Other output contains variables that are not requested (all SOLUTION variables are always written). When WRT_RESTART_COMPACT= YES, we do not automatically write the SOLUTION fields to e.g. paraview.

3. When WRT_RESTART_COMPACT= NO, we keep the original behavior for backward compatibility.

4. additionally, we write compact surface .csv files.

Related Work

Mentioned in Issue (request) #2118

PR Checklist

• [x] I am submitting my contribution to the develop branch.
• [x] My contribution generates no new compiler warnings (try with --warnlevel=3 when using meson).
• [x] My contribution is commented and consistent with SU2 style (https://su2code.github.io/docs_v7/Style-Guide/).
• [x] I used the pre-commit hook to prevent dirty commits and used pre-commit run --all to format old commits.
• [ ] I have added a test case that demonstrates my contribution, if necessary.
• [ ] I have updated appropriate documentation (Tutorials, Docs Page, config_template.cpp), if necessary.