feat: measuring compute efficiency per job

[cmeesters]

The aim of this PR is:

• measure compute efficiency similar to seff
• report compute efficiency and memory footprint per job of the workflow (in a logfile) and
• issue a warning, if it falls below a configurable threshold

Note: seff reports so-called "Memory Efficiency". What is meant is: "Memory Usage", because an application which reserve a compute node to compute and hardly uses RAM to do so, will have an apparently low "Memory Efficiency". It needs to reserve the memory of that node, might be highly efficient, but will not have used memory.

The resulting code of this PR will hence NOT report warnings about memory usage.

This PR is related to issue #147

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