🚀 [Feature] Multi-threaded processing

[darkdragon-001]

Problem to address
Modern systems provide multiple cores which are unused when the scripts run in a single thread.

Feature description
Process tasks concurrently to speed up processing of many laws significantly.

Implementation details
Use queue module.

It should be used optionally with a command-line flag.

[mk-pmb]

If we can split workload accross different machines (virtual machines with one or very few cores), that would be even better in some scenarios. Maybe we can define some notion of todo range and then have each machine work on its assigned range?
If needed we can run a todo scanner first that then suggests ranges. A 3rd-party script specific to the cloud infrastructure can then use those suggestions to spin up the appropriate VMs.