feat(sfr): kinematic wave approximation option

[jdhughes-usgs]

Checklist of items for pull request

• Added new test or modified an existing test
• Ran black on new and modified autotests
• Formatted new and modified Fortran source files with fprettify
• Added doxygen comments to new and modified procedures
• Updated meson files, makefiles, and Visual Studio project files for new source files
• Updated definition files
• Updated develop.tex with a plain-language description of the bug fix, change, feature; required for changes that may affect users
• Updated input and output guide
• Removed checklist items not relevant to this pull request

For additional information see instructions for contributing and instructions for developing.

[langevin-usgs]

A few comments to consider. The method looks like it is working as expected, especially based on our offline discussion of the Mahoning Creek example.