Add pkcs12 BER support

[KaymeKaydex]

// ASN.1 is a syntax for specifying abstract objects and BER, DER, PER, XER etc
// are different encoding formats for those objects. Here, we'll be dealing
// with DER, the Distinguished Encoding Rules. DER is used in X.509 because
// it's fast to parse and, unlike BER, has a unique encoding for every object.
// When calculating hashes over objects, it's important that the resulting
// bytes be the same at both ends and DER removes this margin of error.
//
// ASN.1 is very complex and this package doesn't attempt to implement
// everything by any means.

But BER still important format
And now i have an error : error reading P12 data: asn1: syntax error: indefinite length found (not DER)

[ALTree]

It looks like there's no plan to add BER support, see #12267 and #14145.

Closing here as a dup.