[Agent] Implement intel rapl collector

[varev-dev]

[szlachta99]

I started work on the rapl collector on agent/feat/rapl-collector branch. Rapl allows for collecting energy usage data on multiple levels: platform, package, core, uncore, dram and gpu, but some generations only support a subset of these features. How granular of a platform detection system do we implement? Current implementation only checks usage on platform level which is most widely supported.

[varev-dev]

For the PoC, we don't need granular configuration.

1. Scan /sys/class/powercap/intel-rapl/.
2. Auto-detect whatever domains are present
   (i would say package and dram are priorities).

Just implement dynamic discovery of existing folders.
If package is there, read it. If not, skip it. Keep it simple.