Use SwiftASN1 by Apple

[MoNTE48]

Use swiftasn1 by Apple https://swiftpackageindex.com/apple/swift-asn1/main/documentation/swiftasn1

Additional Context

Using the official Apple library is probably preferable?

[tikhop]

Hi @MoNTE48,
Thanks for bringing this up. I was thinking about it for some time and even tried to use it, but back then they didn't support asn1 objects with unknown length. Later on they added support for it.
Another thing is that it's way slower than existing implementation.
Anyway, I still think to integrate it one day.