Route a request through an ActorGroup

Canonical source: protos/examples/concurrency/actor-group-request.protos at locked revision e99b712ecf658a527b1fe82c8beba2c1286d8dc9.

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// Group routing selects one eligible member. Both workers expose the same
// observable `size` result, so this example does not assume which member ran it.
first: Actor.spawn("std:collections/Set", "call", "Ada", "Grace")
second: Actor.spawn("std:collections/Set", "call", "Linus", "Ken")
workers: Actor.group(first, second)

print(workers.request("size").value())

first.stop()
second.stop()

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