feat: enhance CI configuration and avoid setuptools

[jkrimmer]

Since only python ≥ 3.9 is officially supported, we can avoid the deprecated distutils completely by relying on scikit-build with meson/ninja and make the CI succeed. Now, the library is already built when calling pip install . and cmake.py is not needed anymore. Unfortunately, I have not been able to test compiling with ifort on Windows.

• Added log level input to workflow_dispatch in CI configuration.
• Updated Python versions in CI matrix to include 3.13 and 3.14.
• Improved error handling in base.py for missing lowtran7 extension.
• Removed deprecated cmake.py and integrated build logic into f2pyTarget.cmake.
• Updated f2py.cmake to use Python3 components and improved error messages.
• Slightly increase test assertion tolerance for success on Apple Silicon.
• Updated README to reflect new dependencies and installation instructions.
• Enhanced .gitignore to include additional build artifacts and logs.