Document stream<T>, future<T>, and async func in WIT Reference#355
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Extend the WIT Reference with the three primitives that the Component Model added for WASI 0.3: stream<T> and future<T> as new built-in types after Tuples, and async func as a new subsection of Functions. Each entry covers the WIT syntax with worked examples, notes the value-not-resource property of the new types, and cross-links to design/async.md for the underlying motivation. Signed-off-by: Eric Gregory <eric@cosmonic.com>
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Adds reference entries for the three WIT primitives that the Component Model added for WASI 0.3. Stacked on PR #352