scikit-survival

This release fixes several issues with packaging scikit-survival.

• Added backward support for gcc-c++ by @navashiva (#255).
• Do not install C/C++ and Cython source files.
• Add packaging to build requirements in pyproject.toml.
• Exclude generated API docs from source distribution.
• Add Python 3.10 to classifiers.

• Use permutation_importance from sklearn instead of eli5.
• Build documentation with Sphinx 4.4.0.
• Fix missing documentation for classes in sksurv.meta.

• @navashiva made their first contribution in https://github.com/sebp/scikit-survival/pull/255

Full Changelog: https://github.com/sebp/scikit-survival/compare/v0.17.1...v0.17.2