BUG: fix stringdtype singleton thread safety #28864
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Backport of #28862.
Fixes #28813.
Two orthogonal but related fixes.
First, to guard against newly created StringDType instances being shared between threads, we acquire the allocator lock before reading and possibly setting the
array_ownedflag on a descriptor passed to the descriptor finalization function.Second, I completely removed the
singletonforStringDType. SinceStringDTypeuses per-array descriptors, we're always going to need to create a new descriptor for each array anyway. We probably don't want an array to use a globally shared instance either. The tests pass with no other changes to the codebase besides deleting the code that creates the singleton, so I think it's not needed for anything either.Not sure if we're going to do another 2.2.x, but I think this is also safe to backport.