Updated metrics and parquet output

[DanteNiewenhuis]

Summary

Added power_draw to the output metrics. Renamed power_total to energy_usage

Implementation Notes ⚒️

The metric power_total is renamed to energy_usage to better explain what it does.
power_draw is added as an additional metric.

power_draw states the power drawn by the component when monitored in Watt.
energy_usage takes the sample rate into account, en states the energy used since the previous sample in Joule.

The folder structure of the parquet files is changed. All three parquet files are now put in the same folder, with a different name.

External Dependencies 🍀

N/A

Breaking API Changes ⚠️

1. power_total is renamed to energy_usage
2. The folder structure of the parquet files is changed.

Simply specify none (N/A) if not applicable.

[codecov]

Codecov Report

Attention: 19 lines in your changes are missing coverage. Please review.

Comparison is base (616017b) 0.00% compared to head (0465e2d) 70.84%.

Files	Patch %	Lines
.../telemetry/export/parquet/ParquetHostDataWriter.kt	0.00%	15 Missing ⚠️
.../telemetry/export/parquet/ParquetComputeMonitor.kt	0.00%	3 Missing ⚠️
...rg/opendc/web/runner/internal/WebComputeMonitor.kt	0.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             master     #195       +/-   ##
=============================================
+ Coverage          0   70.84%   +70.84%     
- Complexity        0     2180     +2180     
=============================================
  Files             0      354      +354     
  Lines             0     9808     +9808     
  Branches          0     1036     +1036     
=============================================
+ Hits              0     6948     +6948     
- Misses            0     2537     +2537     
- Partials          0      323      +323     

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