bigfile/py: Allow PyBigFile backend to expose "mmap overlay" functionality
This patch logically continues previous change `bigfile/virtmem: Introduce "mmap overlay" mode` and exposes mmap-overlay functionality to Python: if PyBigFile backend provides .blkmmapper PyCapsule the mmap-related methods will be extracted from it and passed on through to virtmem - see _bigfile.h for details. ZBigFile will use this to hook into using WCFS.
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