Wrap errors returned from Detect and New in sdk/resource

[MrAlias]

Currently, the errors returned from these functions do not wrap errors. This means that external users cannot use the Go errors.Is function to test their error is successfully returned from their resource detectors¹. This resolves this introducing an unwrap-able detectErr that is returned from an new internal copy of Detect.

The internal copy of Detect, detect, is used to allow New to pass a resource with the appropriate schema URL set. This means the schema URL collision of detect is reused instead of duplicating the functionality for New. Also, this avoid an additional allocation when the returned *Resource from Detect in New was discarded when it was later merged into another new *Resource.

Footnotes

1. https://github.com/open-telemetry/opentelemetry-go/pull/3812#discussion_r1120995919 ↩

[codecov]

Codecov Report

Merging #3844 (179bb20) into main (60f7d42) will increase coverage by 0.0%.
The diff coverage is 94.2%.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #3844   +/-   ##
=====================================
  Coverage   81.7%   81.7%           
=====================================
  Files        168     168           
  Lines      12462   12477   +15     
=====================================
+ Hits       10182   10195   +13     
- Misses      2065    2067    +2     
  Partials     215     215           

Impacted Files	Coverage Δ
sdk/resource/auto.go	90.6% <93.9%> (+0.6%)	⬆️
sdk/resource/resource.go	76.5% <100.0%> (-1.4%)	⬇️
sdk/trace/batch_span_processor.go	81.1% <0.0%> (-0.9%)	⬇️
exporters/jaeger/jaeger.go	91.1% <0.0%> (+0.8%)	⬆️