Allow to prematurely terminate processing when a criteria is met

[filip26]

Is your feature request related to a problem? Please describe.
Huge documents might cause the processor to run for a long time. To avoid a service distribution by a malicious attack a processing time time must be restricted by a configurable option.

Describe the solution you'd like
Possible solutions:

• time limit - terminate computation after a defined period
• a limit based on a number of processed nodes

Describe alternatives you've considered
The other way could be to kill a process executing a processor from outside.

[filip26]

moving to another milestone as it's still WIP. Partial implementation covering only some algos will be released as part of 1.4.0 marked experimental