[Feat]: Don't expose EventQueue in AgentExecutor

[kabir]

Is your feature request related to a problem? Please describe.

No response

Describe the solution you'd like

It feels like internal API, while TaskUpdater is more public API.
It seems unnecessary to expose the EventQueue.
We could keep a default implementation of the existing AgentExecutor method which just creates the TaskUpdater and calls the new method.

Then TaskUpdater will need updating to be able to pass in other event types.

Describe alternatives you've considered

No response

Additional context

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

[jmesnil]

then TaskUpdater will need updating to be able to pass in other event types.

+1, this would also be the right opportunity to fix #490 ?