wa_results_collector: Add parquet cache for energy_measurement

The parquet format is faster and smaller, compared to the original CSV
created by WA. This brings a decent improvement for any subsequent run.

E.g. for a PCMark run on a Pixel4:

 +-----------------------------+
 | CSV     | 5 sec    | 300 MB |
 | Parquet | 0.01 sec |  46 MB |
 +-----------------------------+

Improving the feature readability by separating the energy_measurement
support into a separated function.