Add mode of getting binlog timestamps using mysqlbinlog and go-mysql/replication

[caffeinated92]

This PR should fix #579

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[svaroqui]

Hello both methods can be needed for example slapos will always prefer using mysqlbinlog , i would rather like a parameter that list all possible options to extract binlog and default to go-mysql as it's the only embedded one. Also it is prefered to have choice as go mysql being implementation of the binlog protocol it could potentialy lag behind protocol changes and we wan't a way out using mysql or mariadb mysqlbinlog

[caffeinated92]

I will add the function and check for the preferences

[caffeinated92]

At first mysqlbinlog has different datetime after parse. But after changing to time.Local, the value is already same with go-mysql (which is the correct value)