feat: Add an option to use "CPU usage" for stress.

[bgrozev]

No description provided.

[codecov]

Codecov Report

Merging #2060 (3425463) into master (63849ed) will decrease coverage by 0.05%.
The diff coverage is 36.70%.

@@             Coverage Diff              @@
##             master    #2060      +/-   ##
============================================
- Coverage     42.50%   42.46%   -0.05%     
- Complexity     1662     1664       +2     
============================================
  Files           325      327       +2     
  Lines         17151    17211      +60     
  Branches       2239     2243       +4     
============================================
+ Hits           7290     7308      +18     
- Misses         9154     9193      +39     
- Partials        707      710       +3     

Files	Coverage Δ
...c/main/java/org/jitsi/videobridge/Videobridge.java	34.76% <50.00%> (-1.36%)	⬇️
...itsi/videobridge/load_management/CpuLoadSampler.kt	0.00% <0.00%> (ø)
...itsi/videobridge/load_management/CpuMeasurement.kt	0.00% <0.00%> (ø)
...itsi/videobridge/load_management/JvbLoadManager.kt	65.30% <50.00%> (-19.31%)	⬇️

... and 4 files with indirect coverage changes

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