Add SDK.Resource() to otelconf/v0.3.0

[iblancasa]

Fixes #8659

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.2%. Comparing base (2c2127d) to head (0f36d7d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #8660   +/-   ##
=====================================
  Coverage   82.1%   82.2%           
=====================================
  Files        183     183           
  Lines      13901   13907    +6     
=====================================
+ Hits       11426   11443   +17     
+ Misses      2067    2056   -11     
  Partials     408     408           

Files with missing lines	Coverage Δ
otelconf/v0.3.0/config.go	93.3% <100.0%> (+0.4%)	⬆️

... and 1 file with indirect coverage changes

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[linux-foundation-easycla]

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• ✅ login: dmathieu / name: Damien Mathieu (0f36d7d)

[dmathieu]

We shouldn't merge this until open-telemetry/opentelemetry-specification#4948 has been agreed upon.

[iblancasa]

open-telemetry/opentelemetry-specification#4948 has been merged. I think we are ok to merge this one.