Add core for build tests

[mauneyc-LANL]

PR Summary

Currently the only test in ports-of-call is the install test. This PR does a minimal build configuration for inline tests.

I have included a test from spiner that tests PortableMDArray, but that is just so there is something to test. It appears there are several tests in spiner that should properly be in ports-of-call.

New CMake options:

• -DBUILD_TESTING=[ON/OFF] for triggering the build of the test exe(s)
• -DPORTS_OF_CALL_TEST_KOKKOS=[ON/OFF] for configuring for testing with Kokkos

Dependencies

I'm taking a "less-is-more" approach here; if you want to test, you need Catch2 available - diddo with Kokkos. Further, I've deliberately left out an option for Kokkos CUDA; If you want that, then install Kokkos with CUDA enabled.

CI ?

Should the git[hub/lab] CI begin running these tests? Or should that be a separate PR?

PR Checklist

• [ ] Any changes to code are appropriately documented.
• [ ] Code is formatted.
• [ ] Install test passes.
• [ ] Docs build.
• [ ] If preparing for a new release, update the version in cmake.

[dholladay00]

as long as @Yurlungur is good with the option name this looks g2g.