⚗ [RUMF-971] experiment to detect when the computer goes to sleep

[BenoitZugmeyer]

Motivation

This is part of an investigation where we observed abnormally high resource durations and web vital timings

Changes

Add an experimental way to detect when the computer goes to sleep. Use it on resources and internal monitoring logs to help investigation.

Testing

Unit, manual

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I have gone over the contributing documentation.

[codecov-commenter]

Codecov Report

Merging #976 (83b510a) into main (d9fa056) will decrease coverage by 0.02%.
The diff coverage is 87.09%.

@@            Coverage Diff             @@
##             main     #976      +/-   ##
==========================================
- Coverage   88.92%   88.90%   -0.03%     
==========================================
  Files          83       84       +1     
  Lines        3874     3902      +28     
  Branches      858      864       +6     
==========================================
+ Hits         3445     3469      +24     
- Misses        429      433       +4     

Impacted Files	Coverage Δ
packages/rum-core/src/boot/startRum.ts	34.48% <0.00%> (-2.56%)	⬇️
...main/rumEventsCollection/resource/resourceUtils.ts	94.66% <ø> (ø)
...umEventsCollection/view/trackInitialViewTimings.ts	96.66% <ø> (ø)
packages/rum-core/src/rawRumEvent.types.ts	100.00% <ø> (ø)
...rumEventsCollection/resource/resourceCollection.ts	94.87% <75.00%> (-2.28%)	⬇️
packages/rum-core/src/domain/trackSleep.ts	95.45% <95.45%> (ø)
packages/core/src/domain/internalMonitoring.ts	95.52% <100.00%> (ø)

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[bcaudan]

LGTM