Describe the solution you'd like

@activity.defn(dynamic=True)
async def my_activity(name: str, *args: Any) -> Any:
    ...

@workflow.defn(dynamic=True)
class MyWorkflow:
    @workflow.run
    async def run(self, name: str, *args: Any) ->Any:
        ...

Something like that. Notes:

• Make sure worker can only have one dynamic activity and/or only one dynamic workflow
• Do we need to support payload passthrough in cases of unknown param/response type?
  • Maybe the signature should only allow *args: Any or payloads: *Payload? Same for return type?