Rollup merge of #58933 - SimonSapin:alloc-prelude-v1, r=Amanieu

Move alloc::prelude::* to alloc::prelude::v1, make alloc a subset of std

This was one of the unresolved questions of https://github.com/rust-lang/rfcs/pull/2480. As the RFC says this is maybe not useful in the sense that we are unlikely to ever have a second version, but making the crate a true subset makes one less issue to think about if we stabilize it and later want to merge standard library crates and have Cargo feature flags to enable or disable parts of the `std` crate.

See also discussion in https://github.com/rust-lang/rust/pull/58175.

Also rename the feature gate and point to a dedicated tracking issue: https://github.com/rust-lang/rust/issues/58935

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