Add typed collector resource attributes based on declarative config

[iblancasa]

Description

Implement OpenTelemetry configuration schema for OpenTelemetry Collector resource attributes.

It keeps backward compatibility.

Link to tracking issue

Updates #14411

[codecov]

Codecov Report

❌ Patch coverage is 95.95960% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.83%. Comparing base (95aacc1) to head (76c87b5).

Files with missing lines	Patch %	Lines
service/internal/resource/config.go	97.87%	1 Missing and 1 partial ⚠️
service/telemetry/otelconftelemetry/resource.go	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #14412   +/-   ##
=======================================
  Coverage   91.83%   91.83%           
=======================================
  Files         679      679           
  Lines       42921    43003   +82     
=======================================
+ Hits        39415    39493   +78     
- Misses       2438     2440    +2     
- Partials     1068     1070    +2     

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[codspeed-hq]

CodSpeed Performance Report

Merging this PR will not alter performance

_{Comparing iblancasa:14411 (13daa26) with main (53be17e)¹}

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

Summary

✅ 61 untouched benchmarks
⏩ 20 skipped benchmarks²

Footnotes

1. No successful run was found on main (f857018) during the generation of this report, so 53be17e was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

2. 20 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[jade-guiton-dd]

Do you think it would be possible to use configoptional.MapList instead of reimplementing the fallback logic? I'm not sure if it would work for your use case, but just in case you hadn't heard of it.

[iblancasa]

Do you think it would be possible to use configoptional.MapList instead of reimplementing the fallback logic? I'm not sure if it would work for your use case, but just in case you hadn't heard of it.

Thanks for the suggestion. You comment actually points to configopaque.MapList.

I looked into it.configopaque.MapList only supports configopaque.String values and doesn’t allow nil. I find this can break backward compatibility. Maybe we can implement something like a configopaque.MapList to solve similar situations like this one?