Add a spawn_blocking function to the async_runtime trait to allow consuming futures synchronously.

[LarryOsterman]

Feature Summary

Executing futures synchronously is a common operation for async runtimes.

Feature Description

Executing futures synchronously is a common operation for async runtimes.

Implement a synchronous spawn_blocking function which takes a future as a parameter and executes the future synchronously in the current thread in a fashion appropriate for the current async runtime.

Use Case

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Alternatives

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Additional Context

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