feat: support adk java

[lmy654]

support adk-java instrumentation

---

Note

Adds a new ADK Java instrumentation module with a ByteBuddy agent that instruments ADK Telemetry and Runner to enrich OpenTelemetry spans with OpenInference attributes.

• Instrumentation (new module instrumentation/openinference-instrumentation-adk-java):
  • Java Agent (TelemetryAgent): Instruments com.google.adk.Telemetry (traceFlowable, traceToolCall, traceCallLlm) and com.google.adk.runner.Runner#runAsync.
  • Advices:
    • TelemetryAdvice/TelemetryVoidAdvice: Set span status/kind and attributes for tools and LLM calls (provider/model, inputs/outputs, messages/parts, tool schemas/calls, usage tokens), and wrap Flowable to capture final events.
    • RunnerAdvice: Capture session/user IDs, metadata, agent name, and input/output details; mark spans as CHAIN.
• Build/Config:
  • New Gradle project with Shadow JAR (Premain-Class), ByteBuddy/OTel/OpenInference deps; added to settings.gradle.
  • CHANGELOG.md initialized for version 0.1.0.

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[lmy654]

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[lmy654]

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[nate-mar]

Thanks for this! Will take a look!