Add Google ADK Agents integration for Temporal workflows

[tconley1428]

Summary

• Add comprehensive Google ADK (Agent Development Kit) integration for Temporal workflows
• Provides deterministic runtime for ADK agents within Temporal workflows
• Includes MCP (Model Context Protocol) tool support for extensible agent capabilities
• Features OpenTelemetry integration for observability

Key Features

• TemporalModel: Intercepts LLM model calls and executes them as Temporal activities
• TemporalAdkPlugin: Worker plugin that ensures determinism and proper serialization
• MCP Integration: Execute MCP tools as activities with full workflow support
• Deterministic Runtime: Replaces time.time() and uuid.uuid4() with workflow-safe alternatives
• Activity Configuration: Configurable timeouts, retries, and task queues for model calls
• Sandbox Compatibility: Works with both sandboxed and unsandboxed workflow runners

Files Added

• temporalio/contrib/google_adk_agents/ - Core integration package
• Comprehensive test suite with replay validation
• Documentation and usage examples

Test Plan

• Unit tests for all core components
• Integration tests with actual ADK agents
• Replay validation tests to ensure determinism
• MCP toolset integration tests
• OpenTelemetry instrumentation tests

🤖 Generated with Claude Code

[drewhoskins-temporal]

LGTM

[drewhoskins-temporal]

This needs to list a workflow and maybe activities.

[tconley1428]

It's really just demonstrating the registration of the plugin, I don't think it's necessary to make up a workflow to put in. Activities certainly not required.