Add openmetrics go impl

[sarah-witt]

What does this PR do?

Motivation

Describe how you validated your changes

Additional Notes

[dd-octo-sts]

Go Package Import Differences

Baseline: 531db7b
Comparison: c600e19

binary	os	arch	change
agent	linux	amd64	+2, -0 +github.com/DataDog/datadog-agent/pkg/collector/corechecks/openmetrics +github.com/DataDog/datadog-agent/pkg/collector/corechecks/openmetrics/scraper
agent	linux	arm64	+2, -0 +github.com/DataDog/datadog-agent/pkg/collector/corechecks/openmetrics +github.com/DataDog/datadog-agent/pkg/collector/corechecks/openmetrics/scraper
agent	windows	amd64	+2, -0 +github.com/DataDog/datadog-agent/pkg/collector/corechecks/openmetrics +github.com/DataDog/datadog-agent/pkg/collector/corechecks/openmetrics/scraper
agent	darwin	amd64	+2, -0 +github.com/DataDog/datadog-agent/pkg/collector/corechecks/openmetrics +github.com/DataDog/datadog-agent/pkg/collector/corechecks/openmetrics/scraper
agent	darwin	arm64	+2, -0 +github.com/DataDog/datadog-agent/pkg/collector/corechecks/openmetrics +github.com/DataDog/datadog-agent/pkg/collector/corechecks/openmetrics/scraper
agent	aix	ppc64	+2, -0 +github.com/DataDog/datadog-agent/pkg/collector/corechecks/openmetrics +github.com/DataDog/datadog-agent/pkg/collector/corechecks/openmetrics/scraper
iot-agent	linux	amd64	+2, -0 +github.com/DataDog/datadog-agent/pkg/collector/corechecks/openmetrics +github.com/DataDog/datadog-agent/pkg/collector/corechecks/openmetrics/scraper
iot-agent	linux	arm64	+2, -0 +github.com/DataDog/datadog-agent/pkg/collector/corechecks/openmetrics +github.com/DataDog/datadog-agent/pkg/collector/corechecks/openmetrics/scraper
heroku-agent	linux	amd64	+2, -0 +github.com/DataDog/datadog-agent/pkg/collector/corechecks/openmetrics +github.com/DataDog/datadog-agent/pkg/collector/corechecks/openmetrics/scraper

[datadog-datadog-prod-us1-2]

🎯 Code Coverage (details)
• Patch Coverage: 62.29%
• Overall Coverage: 50.44% (+0.08%)

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: c600e19 | Docs | Datadog PR Page | Give us feedback!}

[dd-octo-sts]

Files inventory check summary

File checks results against ancestor 531db7b4:

Results for datadog-agent_7.80.4.git.6.c600e19.pipeline.124452003-1_amd64.deb:

No change detected

[dd-octo-sts]

Static quality checks

✅ Please find below the results from static quality gates
Comparison made with ancestor 531db7b
📊 Static Quality Gates Dashboard
🔗 SQG Job
SOME SIZE DELTAS ARE N/A (ANCESTOR METRICS NOT YET AVAILABLE). RETRY JOB

Successful checks

Info

	Quality gate	Change	Size (prev → curr → max)
✅	agent_deb_amd64	N/A	N/A → 744.609 → 750.960
✅	agent_deb_amd64_fips	N/A	N/A → 702.457 → 703.350
✅	agent_heroku_amd64	N/A	N/A → 311.135 → 315.100
✅	agent_msi	N/A	N/A → 611.478 → 624.460
✅	agent_rpm_amd64	N/A	N/A → 744.593 → 750.930
✅	agent_rpm_amd64_fips	N/A	N/A → 702.441 → 703.330
✅	agent_rpm_arm64	N/A	N/A → 722.112 → 724.690
✅	agent_rpm_arm64_fips	N/A	N/A → 683.145 → 685.090
✅	agent_suse_amd64	N/A	N/A → 744.593 → 750.930
✅	agent_suse_amd64_fips	N/A	N/A → 702.441 → 703.330
✅	agent_suse_arm64	N/A	N/A → 722.112 → 724.690
✅	agent_suse_arm64_fips	N/A	N/A → 683.145 → 685.090
✅	docker_agent_amd64	N/A	N/A → 804.756 → 806.500
✅	docker_agent_arm64	N/A	N/A → 807.108 → 810.310
✅	docker_agent_jmx_amd64	N/A	N/A → 995.654 → 997.220
✅	docker_agent_jmx_arm64	N/A	N/A → 986.658 → 989.990
✅	docker_cluster_agent_amd64	N/A	N/A → 206.912 → 207.710
✅	docker_cluster_agent_arm64	N/A	N/A → 220.881 → 221.210
✅	docker_cws_instrumentation_amd64	N/A	N/A → 7.154 → 7.190
✅	docker_cws_instrumentation_arm64	N/A	N/A → 6.689 → 6.920
✅	docker_dogstatsd_amd64	N/A	N/A → 39.439 → 39.560
✅	docker_dogstatsd_arm64	N/A	N/A → 37.614 → 38.080
✅	docker_host_profiler_amd64	N/A	N/A → 302.238 → 315.880
✅	docker_host_profiler_arm64	N/A	N/A → 313.710 → 327.470
✅	dogstatsd_deb_amd64	N/A	N/A → 30.170 → 30.790
✅	dogstatsd_deb_arm64	N/A	N/A → 28.292 → 29.290
✅	dogstatsd_rpm_amd64	N/A	N/A → 30.170 → 30.790
✅	dogstatsd_suse_amd64	N/A	N/A → 30.170 → 30.790
✅	iot_agent_deb_amd64	N/A	N/A → 44.683 → 45.230
✅	iot_agent_deb_arm64	N/A	N/A → 41.629 → 42.800
✅	iot_agent_deb_armhf	N/A	N/A → 42.341 → 42.960
✅	iot_agent_rpm_amd64	N/A	N/A → 44.684 → 45.230
✅	iot_agent_suse_amd64	N/A	N/A → 44.684 → 45.230

[dd-octo-sts]

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