Document Db2 settings making an difference on end-to-end latency [DBZ-1811]

Migrated from [DBZ-1811](https://issues.redhat.com/browse/DBZ-1811)

As discussed, there should be a discussion in the connector docs on the different options that impact the end-to-end latency for Db2, as well as their implications such as increased DB load, network usurpation etc.

Start by locating the connector documentation for Db2 settings. Document the options that affect end-to-end latency and explain implications such as increased database load and network usage; the work is done when these trade-offs are covered clearly in the connector docs.

Written by the indexing model from the issue text.