io: Add convenience method AsyncSeekExt::rewind.
#4107
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Motivation
Since version 1.55 has the Rust std library implemented a convenience function called rewind that is part of the io::Seek trait. I have found this to be a very helpful function in making my code more readable/simpler.
Solution
Implement the rewind function as part of the AsyncSeekExt trait.
[Disclaimer]
The test might not be in the proper place apologies for that. I didn't know of a better place to put it.