fix: add missing jdk http sender for otlp metrics exporter

[adhraj12]

Description

Resolves #3111.

The automq-metrics module enables the OTLP HTTP exporter but fails to provide a concrete HTTP sender implementation, leading to a crash on startup when OTLP is enabled. The opentelemetry-exporter-otlp artifact does not include a sender by default and expects one to be available on the classpath.

This PR:

• Adds io.opentelemetry:opentelemetry-exporter-sender-jdk:1.40.0 to project dependencies.
• Injects this dependency into the automq-metrics module to utilize the native JDK 17 HttpClient.

Testing Strategy

• Build Verification: Ran ./gradlew :automq-metrics:jar to ensure successful compilation.
• Dependency Verification: Verified that opentelemetry-exporter-sender-jdk is present in the runtime classpath of automq-metrics.

Committer Checklist (excluded from commit message)

• Verify design and implementation
• Verify test coverage and CI build status
• Verify documentation (including upgrade notes)