refator: sensor's architecture redesign

[iximiuz]

The redesign is supposed to make the codebase:

• More (unit-)test friendly.
• Prepared for IOContext (name tbd) introduction.
• Prepared for incremental artifact storing.

Introduced abstractions:

• Sensor - to abstract differences in the standalone and controlled execution flows.
• Monitor (fanotify & ptrace) - makes an act of monitoring a noun instead of a verb (easier to pass around and interact with).
• CompositeMonitor - to abstract multiple monitors behind single entity and simplify the code of the (controlled and standalone) sensors.

TODO:

• IOContext (name tbd) - to abstract reading monitoring commands, sending events, errors, and logs back to the sensor user.

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Legend

[kcq]

can you also create an issue to track the not fixed discoveries

[iximiuz]

Here they go:

• #405
• #406