Add sample of batch executions #92
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What
Add an example on how to batch start activities while holding concurrency limits
Why
Fanout use cases are common in workflows. However, current Cadence server doesn't support batch user cases well. The "correct" way to not bombard the server is to control the concurrency limits of activities so we don't experience lock contentions on mutable states.
Next
We might want to expose some APIs in client like
workflow.BatchExecuteActivity
so users can easily write scaling workflow code.