Add ability to dump cert from MachOs

[blacktop]

Discussed in #73

^{Originally posted by kushalagrawal January 20, 2022}
Hi blacktop,

we have multiple maco and fat binaries which are internal binaries. These binaries are signed by the internal CA and then uploaded to a remote location.
before I serve it to end user, I wants to make sure they are not tempered therefore I wants to validate using the internal CA's public key. if they are signed by that internal CA. Is There any direct way that I can extract the certificate chain associate with maco and fat binary.

Thanks
Kushal

[blacktop]

This has been added in the latest release here - https://github.com/blacktop/ipsw/releases/tag/v3.1.66

> ipsw macho info MACHO_FILE --dump-cert --output /folder/to/write/cert/