addX509Cert
Adds a standalone X.509 certificate to the trust manager.
Return
The newly created and persisted TrustEntryX509Cert.
Parameters
certificate
The X509Cert to be trusted. Must contain a Subject Key Identifier (SKI).
metadata
Associated metadata (like a display name or icon) for the certificate.
Throws
if the certificate lacks an SKI.
if a certificate with the same SKI is already managed.