BlessingEntry contains important logged information about a blessed principal.
BlessingLogReader provides the Read method to read audit logs. Read returns a channel of BlessingEntrys whose extension matches the provided email.
NewSQLBlessingAuditor returns an auditor for wrapping a principal with, and a BlessingLogReader for reading the audits made by that auditor. The config is used to construct the connection to the SQL database that the auditor and BlessingLogReader use.