Backward compatibility with v1.7.1/2 for the IO Monad#2125

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return-IO.Primitive

Commits on Oct 6, 2023

Fix #2124: `IO.Primitive.return` (alias for `pure`) for backwards compat
andreasabel
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Restore Category/* tree of v1.7 as deprected module aliases
andreasabel
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Deprecation warning for `IO.Primitive.return`
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