Capture KeepAlive instead of Executor in WriterOptions #115
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Summary:
folly::Executor::KeepAlive<> is the recommended way of holding
references to Executors, as they ensure the executor is kept alive until the
KeepAlive object is destroyed. Because of this, some folly APIs can only return
KeepAlive (and not shared_ptr), such as Global pools.
These APIs cannot use WriterOption is it takes a shared_ptr
Reviewed By: xiaoxmeng
Differential Revision: D66741079