Fewer RowQueryEvents than expected observed in BinlogStreamer

[fjordan]

In tests added by @hkdsun in this commit, we noticed that the number of RowQueryEvents that were observed by the BinlogStreamer (to be written to the Target) did not directly correlate with the number of binlog events on the Source.

From slack:

I found that if it replicated a total of let's say 200 binlog events (as part of the multi-statement) from the source binlog, i was seeing like 81 (with some unexplainable randomness in this number) RowQueryEvents appearing on the target

We need to identify why this is happening, and if there is some potential problem in the BinlogStreamer's configuration or an underlying library.