BLD: Add CI runner for core test suite (no optional dependencies) #1314
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This PR adds a GitHub Actions workflow for running the test suite with none of the optional dependencies present in the environment.
The idea is to catch bugs where either a test or (worse) a piece of the core Traits functionality accidentally depends on another package being present.
It seems unnecessary to runs these tests on all possible combinations of Python version and platform (which would give 12 jobs), but given that there's potential for dependency bugs to be both platform-specific and Python-version specific, we compromise by testing only on Windows and Linux, and only on Python 3.6 and Python 3.9, for a total of four jobs.
Closes #1299.