Build universal shared libraries for macOS [2 XMR]

[woodser]

Currently, the .dylib shared libraries built on macOS are platform-dependent, so they need generated for both x86_64 and ARM64.

This issue requests building the libmonero-cpp.dylib and libmonero-java.dylib as universal shared libraries which work on either architecture.

See the build instructions to build the dylibs.

[github-actions]

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[NorrinRadd]

Hi @woodser, if this bounty is still open, please assign it to me. Thanks.

[woodser]

I've assigned to you. Thanks @NorrinRadd