otelconf: add support for parsing resource detectors

[codeboten]

Fixes #7252

Will rebase once #8106 is merged

[codecov]

Codecov Report

❌ Patch coverage is 98.13084% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.2%. Comparing base (6497853) to head (52de002).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
otelconf/config_json.go	97.2%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##            main   #8180    +/-   ##
======================================
  Coverage   82.2%   82.2%            
======================================
  Files        195     195            
  Lines      13692   13796   +104     
======================================
+ Hits       11256   11347    +91     
- Misses      2029    2041    +12     
- Partials     407     408     +1     

Files with missing lines	Coverage Δ
otelconf/config_yaml.go	95.1% <100.0%> (+0.2%)	⬆️
otelconf/resource.go	100.0% <100.0%> (ø)
otelconf/config_json.go	94.1% <97.2%> (+0.4%)	⬆️

... and 1 file with indirect coverage changes

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