Hana communicationTimeout not configurable

[kasimos]

Currently in

cds-dbs/hana/lib/drivers/hana-client.js

Line 33 in 8c86b86

communicationTimeout: 60000,

the communicationTimeout for the Hana queries is hardcoded to 1 Minute (60.000ms).
In many cases background jobs running through cds.spawn might tackle db intensive tasks, like cleanups, transformations or calculations that easily exceed the arbitrary 1 minute limit.
It would be good to have an option to configure this, as well as the other options that are currently commented out for the dbConnection.