⚗️ [RUMF-1182] add telemetry sample rate

[bcaudan]

Motivation

Add a sample rate to control which percentage of pages can send telemetry events.

Changes

• New init option telemetrySampleRate?: number
• default value 20, like in the volume projection, could be tweaked when starting to enable customers

Testing

• Local
• Staging
• Unit
• End to end

---

I have gone over the contributing documentation.

[codecov-commenter]

Codecov Report

Merging #1510 (bc61cda) into main (bac8452) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1510      +/-   ##
==========================================
+ Coverage   89.87%   89.91%   +0.03%     
==========================================
  Files         111      111              
  Lines        4316     4322       +6     
  Branches      959      961       +2     
==========================================
+ Hits         3879     3886       +7     
+ Misses        437      436       -1     

Impacted Files	Coverage Δ
...ges/core/src/domain/configuration/configuration.ts	100.00% <100.00%> (ø)
...rc/domain/internalMonitoring/internalMonitoring.ts	98.55% <100.00%> (+0.04%)	⬆️
...sCollection/networkError/networkErrorCollection.ts	92.04% <0.00%> (+1.13%)	⬆️

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