Add the trpl crate to support The Book exercises #1080
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In the upcoming async chapter, because the standard library doesn't include an async runtime, we need to use crates.
To make it easier to manage versions and updates, we've created a shim crate named
trpl
that mostly re-exports relevant parts of other crates in a way that we can control, to ensure the best experience for book readers.While this crate may organically end up in the most-used crates included in the playground eventually, we'd love for the
trpl
crate to be available in the playground for readers before the chapter is officially published.Thank you! ❤️