Backport generic TypedDicts
#46
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As with #44, the tests here are basically copied from the cpython
mainbranch. Unlike #44, however, the implementation needs to be a little bit different. On Python <= 3.10,typing.Genericraises aTypeErrorifGeneric.__init_subclass__is called from_TypedDictMeta.__new__, so I had to work around this.Backport of python/cpython#27663, by Samodya Abey. Closes #7. Cc. @davidfstr.