Feature: Document how mysql system variables should be set

[nickchomey]

Feature description

There was some miscommunication and confusion in another issue which ultimately arose from me using mariadb, and having different system variables.

It might be worth documenting which primary variables need to be set (or at least considered) in order to be maximally compatible with this connector.

MariaDB Binlog/replication Variables

Mysql binlog variables

[lovromazgon]

Note to the implementer - the requirements are similar (a subset) of the ones listed here.

[nickchomey]

At the very least, according to the mysql package used here, it looks like we need to use

binlog_format=ROW         #default is "mixed" in mariadb, "row" in mysql
binlog_row_image=FULL     #default in both mariadb and mysql

[alarbada]

yup @nickchomey, the binlog format we use is row. We probably won't support any other, at least for the foreseeable future, as the library we use right now doesn't support any other format

[nickchomey]

Yes, row seems to be the most functional and compatible for both mariadb and mysql.

But I assume there's some other variables that might be needed to be documented.