Store log name in database in addition to LogID

[pgporada]

When looking at the LogIndexes table, I see the following information.

+----------------------+-----------+
| LogID                | LogIndex  |
+----------------------+-----------+
| -1231231231231231231 |    123 |
+----------------------+-----------+

It's easy to determine what CT log is related to which ct-woodpecker ID when there are only a few monitored logs. When there's many logs, it becomes a burden trying to figure out what LogID corresponds to what CT log.