Parse dylib_commands and dylibs for mach-o

[latonis]

I plan on implementing some more mach-o parsing, but for now starting with dylibs and getting the information from them. 😸

Features implemented:

• dylib_command parsed
• dylib parsed
• total number of dylibs in mach-o

Tests implemented for multiple executables:

• dylib count
• dylib names (paths)

[latonis]

After speaking with @plusvic, will port this PR over to rust and continue new features for mach-o on yara-x.

@plusvic, should I close this PR or do we want to still have open for review and possible merge given its already been written? :smile_cat:

[latonis]

The rust equivalent of this was merged into yara-x with https://github.com/VirusTotal/yara-x/pull/43

[latonis]

Closing this as progress is much heavier on the YARA-X side for Mach-O 😸