[WIP] wallfunctions with thermal law of the wall

[bigfooted]

Proposed Changes

Give a brief overview of your contribution here in a few sentences. When using wall functions in combination with heat transfer, a thermal law of the wall is needed to accurately solve for velocity as well as temperature.

This is a first implementation, only for isothermal walls, and only for the incompressible solver. During the WIP, this will be generalized.

Related Work

Resolve any issues (bug fix or feature request), note any related PRs, or mention interactions with the work of others, if any. Improvement of the wall function implementation

PR Checklist

Put an X by all that apply. You can fill this out after submitting the PR. If you have any questions, don't hesitate to ask! We want to help. These are a guide for you to know what the reviewers will be looking for in your contribution.

• [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).
• [ ] My contribution is commented and consistent with SU2 style (https://su2code.github.io/docs_v7/Style-Guide/).
• [ ] 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.