Build x86_64 and aarch64 for macOS Examples

[bitwizeshift]

The "Bundle" workflow currently only creates a Debug macOS artifact that is built in the architecture of the underlying runner. Currently, this means that it is generating an x86_64 binary -- since apparently this is the default runner.

This task is to track making the workflow build both aarch64 and x86_64 architectures, and releasing both binaries. This will require some level of testing, since cross-compiling is locally causing issues with SDL compilation. It's unclear if this is an issue with the use of the internal cmake build dependency, or whether this is something easier to fix.