feat: add span level measurements #1855

[martinhaintz]

📜 Description

Add support for span level measurements #1855

💡 Motivation and Context

Closes #1855

💚 How did you test it?

Unittests

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• No new PII added or SDK only sends newly added PII if sendDefaultPii is enabled
• I updated the docs if needed
• All tests passing
• No breaking changes

🔮 Next steps

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.28%. Comparing base (384a55c) to head (30c9e3d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2214      +/-   ##
==========================================
+ Coverage   88.22%   88.28%   +0.05%     
==========================================
  Files         230      230              
  Lines        7899     7905       +6     
==========================================
+ Hits         6969     6979      +10     
+ Misses        930      926       -4     

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