Extend the ParallelExtend implementations #1129
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`Vec` originated this "specialization" based on `opt_len`, and the recent `collect_vec_list` used the same technique. Now that is pushed down a layer so that every `impl ParallelExtend` that uses a `LinkedList<Vec<_>>` intermediate can also optimize the indexed case to a single collected `Vec`, before extending the final collection.
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ParallelExtendimpls now try to use theVecpseudo-specialization.ParallelExtendandFromParallelIteratorforOsStringto matchstd(since 1.52).