Support span level measurements

[lucas-zimerman]

Description

• Meta issue [EPIC] Support span level measurements team-mobile#172

According to our develop docs the span protocol supports measurements. The relay protocol definition includes measurements as well.

Up until now, our SDKs set the measurement value on the root transaction instead of the span itself. We should change that to allow measurements on a span level. This will help us reporting slow + frozen frames, frame delay, etc. going forward to span streaming.

🛑 Blocked by

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1. Support span level measurements sentry-javascript#10398
   Feature: Spans +1

[github-actions]

This issue has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you label it Status: Backlog or Status: In Progress, I will leave it alone ... forever!

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"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀

[github-actions]

This issue has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you label it Status: Backlog or Status: In Progress, I will leave it alone ... forever!

---

"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀