feat(micrometer): [Micrometer 1] Add active meters

[adinauer]

PR Stack (Micrometer)

• feat(micrometer): Add Micrometer metrics integration #6084
• feat(micrometer): [Micrometer 1] Add active meters #6085

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📜 Description

Add the framework-neutral sentry-micrometer module and its public SentryMeterRegistry.

The registry forwards positive counter increments and individual timer and distribution-summary recordings through Sentry.metrics(). It remains a normal Micrometer registry for local reads, applies Micrometer naming conventions and filters, converts tags and units to Sentry metric metadata, and coexists with other registries in a composite.

This PR also registers the artifact, SDK integration metadata, package documentation, and release metadata.

💡 Motivation and Context

Micrometer users currently need custom bridge code to send application metrics to Sentry. A dedicated registry lets applications add Sentry as another metrics destination without replacing Prometheus, Datadog, OTLP, or other registries.

This is the first PR in the Micrometer stack. Passive meter polling, FunctionTimer semantics, and Spring Boot auto-configuration follow separately.

💚 How did you test it?

./gradlew spotlessApply apiDump
./gradlew :sentry-micrometer:check

Tests cover active meter forwarding, normal local reads, metadata conversion, filtering, dynamic Sentry scope resolution, failure isolation, lifecycle behavior, and composite-registry coexistence.

📝 Checklist

• I added GH Issue ID & Linear ID
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• I updated the wizard if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.
• Public API changes reviewed by another Mobile SDK team member or implemented according to the develop docs spec.

🔮 Next steps

Add passive gauge, long-task timer, and function-counter polling in the next stack PR.

#skip-changelog

⚠️ Merge this PR using a merge commit (not squash). Only the collection branch is squash-merged into main.

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📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

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📲 Install Builds

Android

🔗 App Name	App ID	Version	Configuration
SDK Size	io.sentry.tests.size	8.56.0 (1)	release

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