fix: add otel consumer R8 rule for optional jackson classes

[abdulraqeeb33]

Description

One Line Summary

Add an OTEL consumer ProGuard rule to suppress optional Jackson core missing-class warnings so Android release builds with R8/Proguard succeed on 5.7.x.

Details

Motivation

Fixes the R8 missing class failure reported in #2576 where io.opentelemetry.exporter references optional com.fasterxml.jackson.core.* classes not present on Android by default.

Scope

• Affects only the otel module consumer ProGuard configuration.
• No runtime behavior changes.
• No public API changes.

OPTIONAL - Other

Rule added in OneSignalSDK/onesignal/otel/consumer-rules.pro:

• -dontwarn com.fasterxml.jackson.core.**

Testing

Unit testing

No unit tests were needed because this is a consumer ProGuard metadata change.

Manual testing

• Ran ./gradlew :OneSignal:otel:assemble successfully.
• Verified consumer-rules.pro is packaged via existing consumerProguardFiles config.

Affected code checklist

• Notifications
  • Display
  • Open
  • Push Processing
  • Confirm Deliveries
• Outcomes
• Sessions
• In-App Messaging
• REST API requests
• Public API changes

Checklist

Overview

• I have filled out all REQUIRED sections above
• PR does one thing
• Any Public API changes are explained in the PR details and conform to existing APIs

Testing

• I have included test coverage for these changes, or explained why they are not needed
• All automated tests pass, or I explained why that is not possible
• I have personally tested this on my device, or explained why that is not possible

Final pass

• Code is as readable as possible.
• I have reviewed this PR myself, ensuring it meets each checklist item

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