perf: Replace std::thread spawn with tokio block_in_place #15517
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…la-rs#15517)" This reverts commit 1d4880f.
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This has the effect of explicitly moving all futures to another thread (if the current thread was polling futures) before blocking on the function using the current thread. It is a no-op if the current thread is not in the tokio runtime.
https://docs.rs/tokio/latest/tokio/task/fn.block_in_place.html