The assortment of remaining tasks to complete transition of DCPTL to cmake + skbuild.

• Enable sycl::program in libsyclinterface/tests/dpcpp_kernels.hpp.
• Add build system configuration to pyproject.toml (e.g. specify dependencies for building docs).
• cmake + skbuild should work with nightly sycl bundles
• Write coverage build driver (scripts/gen_coverage.py)
• Write docs driver (scripts/gen_docs.py)
• Write script to drive build with sycl nightly
• Ensure SDL flags are added to CMakeLists.txt
• Upstream change to skbuild to preserve symbolic link to components of versioned shared library
• Fix dpctl should not vendor versioneer, but use one from PyPI or conda-forge #651, make sure versioneer overrides dpctl/_version.py, a step which relies on using versioneer provided "build_py" step.
• Make sure pybind11 extension can be added to dpctl, which is the ultimate reason for this work