Release GIL when assigning to real or imag components (#71747)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/71747
The getter is trivial as it's just creating a view tensor, but the
setter is actually copying data so does call into kernel code.
Test Plan: Imported from OSS
Reviewed By: anjali411
Differential Revision: D33770046
Pulled By: albanD
fbshipit-source-id: f0a70acaef790ae1e5b2f68ac4ce046e850c9624
(cherry picked from commit 36a0109400b256b32a185fcd05f21f302197c081)
