Add Mach-O security feature detection

[wagoodman]

ELF security feature detections was added in #2443 . It would be nice to also add this same kind of features but for darwin (Mach-O formatted binaries).

Proposed features to detect:

• Code signing, we could reuse/import functions from anchore/quill to do this.
• PIE (same as in ELF)
• Non-Executable stack/heap flags (similar to DEP in PE formatted files)
• Stack canaries
• Hardened runtimes, detectable in the binary's entitlements (there might be a function in anchore/quill for this)

There may be more features to detect that I'm unaware of.