support `--sql-log-bin` (bool)

`--sql-log-bin` would default `true`. When `false`, writes to _ghost_ table will not be logged to binlogs.

This may only work on:
- `--test-on-replica`
- `--migrate-on-replica`
- `--allow-on-master`

This cannot work on normal connect-to-replica-and-write-on-master.

When GTID is enabled such writes would cause errant transactions.

_Note_: the _changelog_ table also gets writes. In the event you're using GTID this still calls for a problem if you're migrating on a replica. See https://github.com/github/gh-ost/issues/146 for more discussion.