Create one example `call_builtin_symbol`, add workflow for auto-test and update dependencies.

[Cy6er7um]

[pchickey]

Hi, sorry this PR never got attention, this repo has been a bit neglected. If you are up for rebasing this work on main, please assign me as a reviewer and I'll merge it.

I believe the extern symbols should be declared as extern "C" so that they have a defined ABI - rust ABI is equivalent for those, but in theory it could change.