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This change introduces new implementation files for the A2aAgentExecutor and event converters. The existing A2aAgentExecutor now acts as a wrapper, allowing a switch between the legacy and new implementations. The new implementation includes support for execution interceptors and a dedicated executor context. Main Changes= `a2a_agent_executor_impl.py` = the new implementation of the AgentExecutor differs from the legacy one (`a2a_agent_executor.py`) for the removal of the TaskResultAggregator and the explicit `InvocationContext` creation. Instead, it uses `ExecutorContext` and delegates event conversion to the new logic that supports streaming. It maintains an `agents_artifact` state map to handle partial updates and emits TaskArtifactUpdateEvents for content. The `long_running_functions.py` is used to keep track of the LongRunning FunctionCalls and respective FunctionResponse, to emit them at the end of the generation loop in a `TaskStateUpdateEvent(input-required/auth-required)`. `from_adk_event.py` = this file replaces the conversion functions in the `event_converter.py` used to convert the adk events into a2a events, estrapolating them in a dedicated file. The main changes in the methods are the introduction of TaskArtifactUpdateEvent to handle content parts, allowing for true artifact streaming and chunking. It utilizes an `agents_artifacts` dictionary to track artifact IDs across partial events to correctly handle append operations. PiperOrigin-RevId: 878399140