Connect call optional arguments

Feature request
Extend the list of properties in the connect() call with

• nr_threads= to control the level of parallelism (0=all cores used)
• memorylimit= to control the memory footprint allowed in :memory: mode in MB
• querytimeout= seconds before a query is forced to terminate
• logging= the file location for the tracer files
• username= used to connect to a remote server
• password= credentials to reach the remote server
• port= optional TCP/IP port to listen for connections

For a web frontend, it would be helpful to set if pagination is allowed and what the page size would be.

Memory limit is currently in bytes. Perhaps move to MB

[gijzelaerr]

implemented on the Python side