⚗️[RUM-2889] custom vitals improvements

[bcaudan]

Motivation

Following #2591, add more features around custom vitals

Changes

• 🐛 Fix multiple vital creation with multiple stop calls
• ✨ Add event limiter for vitals
• ✨ Add new API options:

DD_RUM.startDurationVital('foo', { context, startTime })
// do some stuff
DD_RUM.stopDurationVital('foo', { context, stopTime })

Testing

• Local
• Staging
• Unit
• End to end

---

I have gone over the contributing documentation.

[bcaudan]

/to-staging

[dd-devflow]

🚂 Branch Integration: starting soon, merge in < 9m

Commit 4c10701474 will soon be integrated into staging-07.

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Use /to-staging -c to cancel this operation!

[dd-devflow]

🚂 Branch Integration: This commit was successfully integrated

Commit 4c10701474 has been merged into staging-07 in merge commit 135905ab1e.

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