Proposal: bring BBP to Arrays

[David Feuer]

It looks like Array and IArray have missed some important BBP bits. In
particular, we have great ways to build arrays out of lists, but not out of
other Foldables. I think we can fix IArray by adding new methods. I think
we can fix up Array by adding some functions to Data.Array or by sticking
Data.Foldable underneath GHC.Arr and sticking them in there (the low-level
fiddling involved would be a better match for GHC.Arr).
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