parsed ASN.1 value of ObjectIdentifier
a string of ObjectIdentifier value (ex. "1.2.3.4")
asn1oidcanon({oid: "P-256"}) -> "1.2840.10045.3.1.7"
asn1oidcanon{{oid: "prime256v1"}) -> "1.2840.10045.3.1.7"
asn1oidcanon({oid: "ecPublicKey"}) -> "1.2.840.10045.2.1"
asn1oidcanon({oid: "1.2.3.4"}) -> "1.2.3.4"
canonicalize parsed ASN.1 ObjectIdentifier value to oid numbers