Add ExtractSerialNumberFromX509Cert primitive in CHIPCryptoPAL.h and OpenSSL

[tcarmelveilleux]

Need to document the basic interface, OpenSSL implementation and add a unit test for:

CHIP_ERROR ExtractSerialNumberFromX509Cert(const ByteSpan & certificate, ByteSpan & out_serial_number_in_place)

This should extract the bytes of an ASN.1 X.509 certificate serial number, from in-place representation. The data is not copied-out, but rather out_serial_number_in_place is updated to point to the contents of the certificate. Only the bytes of the INTEGER should be covered, not ASN.1 length/type prefix.