[core] Add a fuzzing regression test github action #674
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While fuzzing subzero core before the nanopb 0.4.5 upgrade, the fuzzer found a bunch of inputs which triggered UBSAN.
This PR creates a regression test that runs the fuzzer with these inputs and verifies that none of them fail now that we're on nanopb 0.4.5.
If more bad inputs are discovered later, they can be added to this directory after the corresponding bugs are fixed.