Imports of package certificates

PathSynopsis
crypto/x509Package x509 implements a subset of the X.509 standard.
encoding/pemPackage pem implements the PEM data encoding, which originated in Privacy Enhanced Mail.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
github.com/ydb-platform/ydb-go-sdk/v3/internal/xerrors
osPackage os provides a platform-independent interface to operating system functionality.
syncPackage sync provides basic synchronization primitives such as mutual exclusion locks.