fix(sdk-trace-base): derive SpanOptions from API type

[overbalance]

Which problem is this PR solving?

SDK's SpanOptions duplicated fields from the API type, risking silent drift. Also used deprecated SpanAttributes.

Short description of the changes

• Derive SDK SpanOptions from Omit<APISpanOptions, 'root'> instead of duplicating fields
• Use Attributes instead of deprecated SpanAttributes in API's SpanOptions

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• Existing unit tests and type-checks pass

Checklist:

• Followed the style guidelines of this project
• Documentation has been updated

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.70%. Comparing base (124f09e) to head (e01544c).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6478   +/-   ##
=======================================
  Coverage   95.70%   95.70%           
=======================================
  Files         364      364           
  Lines       11779    11779           
  Branches     2751     2751           
=======================================
  Hits        11273    11273           
  Misses        506      506           

Files with missing lines	Coverage Δ
packages/opentelemetry-sdk-trace-base/src/Span.ts	97.83% <ø> (ø)

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[dyladan]

I think this makes sense