Innodb Binlog to be Stored in Archived Redo Log

Once the new backup solution leveraging the innodb redo log archiving has come about, the MDEV-34705 binlog-in-engine for Innodb can be refactored to store the binlog in this log rather than in its own separate binary log files.

In the current MDEV-34705 binlog implementation, row data is written twice, once to the innodb redo log and another time for the binary log file itself. Moving the binary log to be stored in just the redo log would both help improve performance by removing a redundant write, as well as likely other benefits from the reduced complexity of having two separate logs.