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

When returning a SwarmResult from a function call in a swarm, it would be beneficial to be able to terminate it.

This is a request from Discord user choco. Original message here.

choco provided an example:

def publish_results(context_variables:dict) -> SwarmResult:
  ### take something from context_variables and turn it into a final string ###
  return SwarmResult(agent=AfterWorkOption.TERMINATE, context_variables=context_variables, values=final_string)

Describe the solution you'd like

I'm proposing that we allow an AfterWorkOption to be returned in the agent parameter for a SwarmResult.

Additional context

No response