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Adds a `parallel` feature, with an optional dependency on `rayon`, and parallelizes the filling of blocks. Coordinated shared access in the memory blocks is implemented with a `SegmentViewIter` iterator, which implements either `rayon::iter::ParallelIterator` or `core::iter::Iterator` and returns `SegmentView` views into the Argon2 blocks memory that are safe to be used in parallel. The views alias in the regions that are read-only, but are disjoint in the regions where mutation happens. Effectively, they implement, with a combination of mutable borrowing and runtime checking, the cooperative contract outlined in RFC 9106. This is similar to what was suggested in #380. To avoid aliasing mutable references into the entire buffer of blocks (which would be UB), pointers are used up to the moment where a reference (shared or mutable) into a specific block is returned. At that point, aliasing is no longer possible. The following tests have been tried in and pass Miri (modulo unrelated warnings): reference_argon2i_v0x13_2_8_2 reference_argon2id_v0x13_2_8_2