Arvados-llfuse

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- Forked as arvados-llfuse
- Now waits for the _notify_loop thread to complete before exiting
from main(). This prevents a segfault after llfuse.close() removes
the channel but the _notify_loop thread is still executing with
pending notify events and tries to send on the (removed) channel.

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- Note: this is first pyfuse3 release supporting the Cython 3.0.0 release.
- Cythonized using Cython 3.0.0 release.
- Drop Python 3.5, 3.6, 3.7 support, see 69.
Minimum requirement is Python 3.8 now.
- Get rid of PyEval_InitThreads, 55.
- CI: also test on python 3.12 / cython 3.0 release
- Tell Cython that callbacks may raise exceptions, 90.
- Misc. CI, testing, build related fixes/improvements.

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- CI: use the matrix for cy/py combinations, support and test on Cython 3 beta
- cy3: cdef void* f(void* d) noexcept with gil, 78
- cy3: cdef nogil -> noexcept nogil
- tests: use shutil.which() instead of which(1) executable
- tests/examples: fix tmpfs: backport fix from pyfuse3
- tests/examples: fix lltest: add statfs implementation, remove -l from umount

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* cythonize with Cython 0.29.34 (brings python 3.12 support)
* also test on python 3.12-dev
* add a minimal pyproject.toml, 70
* fix basedir in setup.py (malfunctioned with pip install -e .)
* tests: fix integer overflow on 32-bit architectures

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* cythonize with Cython 0.29.30 (brings python 3.11 support)
* also test on python 3.10 and 3.11-dev
* remove "nonempty" default mount option, seems unsupported now.

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* timestamp rounding tests: avoid y2038 issue in test