[Feat]: Support resubscribe operation to any task not just those created by SendStreamingMessage #1180
Description
Is your feature request related to a problem? Please describe.
No response
Describe the solution you'd like
The resubscribe operation in the spec should support resubscribing to the event stream for any task not just ones created via SendStreamingMessage.
This improves the usefulness of this operation as tasks can be created by SendMessage and then later subscribed too for updates by a client when it's interested in that task.
Describe alternatives you've considered
No response
Additional context
This is currently supported already by the python a2a SDK, every task (streaming or not) internally publishes to an event queue and resubscribe taps the event queue.
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