Add another suitable agent framework

[g3force]

The agent-runtime is designed for interchangeable agent frameworks. Currently, we only have one implementation that is based on Google ADK (Python), see:

• https://github.com/agentic-layer/agent-template-adk/
• https://github.com/agentic-layer/sdk-python

The main requirements for the framework are:

• Support and expose the A2A API.
• Support configuration of an AI Gateway for LLM calls.
• OTEL Support would also be really useful.

Here are some ideas:

• LangGraph - https://docs.langchain.com/langsmith/server-a2a
• CrewAI - https://docs.crewai.com/en/learn/a2a-agent-delegation
• Microsoft Agent Framework - https://github.com/microsoft/agent-framework/blob/main/python/packages/a2a/README.md
• Google ADK (Java) - https://github.com/google/adk-java/
• Google ADK (Go) - https://github.com/google/adk-go/

Suggestion: Follow the same pattern as for ADK Python. Create a sdk- repo for the framework specific+independent code and a agent-template repository that creates a container with configuration injected in the same way as the agent-template-adk.

[g3force]

We could also add kagent as framework, to demonstrate a different approach: Instead of creating a deployment, create the Agent CR of kagent and let it manage the agent management.

However, it uses ADK Python under the hood as well. And we can not directly alter the implementation to customize to our needs.