Work towards a nanobind wrapper

python/README.md

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+This assumes that some things are built/installed
+```
+# assumes WORKDIR has:
+# git clone git@github.com/NVIDIA/gdrcopy.git
+# git clone git@github.com:microsoft/mscclpp.git
+
+uname -r
+# 5.4.0-1090-azure
+
+# install
+
+apt update
+apt install -y \
+  build-essential devscripts debhelper check \
+  libsubunit-dev fakeroot pkg-config dkms \
+  nvidia-dkms-525-server \
+  linux-headers-5.4.0-1090-azure 
+
+
+cd $WORKDIR/gdrcopy
+sed -i 's/\(-L \$(CUDA)\/lib64\)/\1 \1\/stubs/' tests/Makefile
+cd packages
+CUDA=/usr/local/cuda ./build-deb-packages.sh
+
+dpkg -i gdrdrv-dkms_2.3-1_amd64.Ubuntu20_04.deb
+dpkg -i libgdrapi_2.3-1_amd64.Ubuntu20_04.deb
+dpkg -i gdrcopy-tests_2.3-1_amd64.Ubuntu20_04+cuda11.6.deb
+dpkg -i gdrcopy_2.3-1_amd64.Ubuntu20_04.deb
+
+# validate:
+# $ sanity
+# Running suite(s): Sanity
+# 100%: Checks: 27, Failures: 0, Errors: 0
+
+# dkms install -m gdrdrv/2.3
+
+cd $WORKDIR/mscclpp
+
+## numctl
+apt install -y numactl libnuma-dev libnuma1
+
+# if not mpi testing
+USE_MPI_FOR_TESTS=0 make -j
+```
+
+
+Rough build attemtps
+```
+# cd to this directory:
+
+cmake -S . -B build
+cmake --build build --clean-first -v
+
+# this should contain libmscclpp.so, but does not
+ldd build/py_mscclpp.cpython-39-x86_64-linux-gnu.so
+
+# this will fail due to a missing symbol
+( cd build;
+  LD_LIBRARY_PATH="$PWD/../../build/lib:$LD_LIBRARY_PATH" python -c 'import py_mscclpp' )
+```