[issue45113] [subinterpreters][C API] Add a new function to create PyStructSequence from Heap.

[Erlend E. Aasland]

Erlend E. Aasland <erlend.aasland at innova.no> added the comment:

FYI, see bpo-43916 regarding the introduction and rationale of introducing Py_TPFLAGS_DISALLOW_INSTANTIATION.

Slightly related: bpo-43908

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