[WIP] add axisymmetric jet case

[bigfooted]

Proposed Changes

V & V testcase for axisymmetric jet (SST and SA) Reproducing the self-similar jet properties reported in Wygnanski & Fiedler (1969) and Hussein, Capp & George (1994).

Related Work

Related to #2197

PR Checklist

• [x] I am submitting my contribution to the develop branch.
• [ ] My contribution generates no new compiler warnings (try with --warnlevel=3 when using meson).
• [ ] My contribution is commented and consistent with SU2 style (https://su2code.github.io/docs_v7/Style-Guide/).
• [ ] 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.