Draft: Add profiling to leapp and snactor

[drehak]

Picking up where #482 left off. For science, profit and fun.

LEAPP_CPROFILE=1 turns on the profiler and shows stats after a successful execution. Maybe an option would be better instead...

[centos-ci]

Can one of the admins verify this patch?

[leapp-bot]

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[zhukovgreen]

FYI https://github.com/benfred/py-spy

[pirat89]

Closing. so far we do not see it valuable right now - and if we find, we can start to work on it again.