✨ [RUM-6581] Add an init parameter to chose feature flags event collection

[RomanGaignault]

Motivation

For now, feature flags are only included in views and errors. This was chosen to limit the feature flags impact on bandwidth, but now that we implemented compression, we could re-evaluate.

Changes

Instead of enabling feature flag collections on all events at once, we could provide an init parameter to allow customers to chose on which events they want to collect feature flags:
init({
collectFeatureFlagsOn: ['long_task', 'error', 'vital']
})

Testing

• Local
• Staging
• Unit
• End to end

---

I have gone over the contributing documentation.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.48%. Comparing base (1386574) to head (d1981c6).
Report is 311 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3198      +/-   ##
==========================================
+ Coverage   93.47%   93.48%   +0.01%     
==========================================
  Files         280      281       +1     
  Lines        7703     7721      +18     
  Branches     1727     1732       +5     
==========================================
+ Hits         7200     7218      +18     
  Misses        503      503              

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[cit-pr-commenter]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	0 B	163.01 KiB	163.01 KiB	N/A%	✅
Logs	0 B	55.84 KiB	55.84 KiB	N/A%	✅
Rum Slim	0 B	111.85 KiB	111.85 KiB	N/A%	✅
Worker	0 B	25.21 KiB	25.21 KiB	N/A%	✅

🚀 CPU Performance

Action Name	Base Average Cpu Time (ms)	Local Average Cpu Time (ms)	𝚫
addglobalcontext	N/A	0.002	0.002
addaction	N/A	0.034	0.034
addtiming	N/A	0.001	0.001
adderror	N/A	0.033	0.033
startstopsessionreplayrecording	N/A	1.064	1.064
startview	N/A	0.490	0.490
logmessage	N/A	0.025	0.025

🧠 Memory Performance

Action Name	Base Consumption Memory (bytes)	Local Consumption Memory (bytes)	𝚫 (bytes)
addglobalcontext	NaN KiB	7.78 KiB	NaN KiB
addaction	NaN KiB	39.66 KiB	NaN KiB
addtiming	NaN KiB	6.70 KiB	NaN KiB
adderror	NaN KiB	43.82 KiB	NaN KiB
startstopsessionreplayrecording	NaN KiB	4.74 KiB	NaN KiB
startview	NaN KiB	425.83 KiB	NaN KiB
logmessage	NaN KiB	41.37 KiB	NaN KiB

🔗 RealWorld