Re-organise tripartite connectivity generation to support multiple primary connection rules #5604

Job	Run time
black	31s
clang-format	20s
copyright_headers	17s
flake8	22s
cppcheck	8m 4s
forbidden_types	15s
isort	13s
mypy	36s
lychee_IGNORED	25s
pydocstyle	24s
pylint	38s
rstcheck	22s
unused_names	18s
vale	36s
sphinx-rtd	3m 27s
sphinx-conda	0s
build_linux (ubuntu-22.04, gcc, boost, optimize, warning)	14m 6s
build_macos (macos-latest, clang, openmp, mpi, python, gsl, ltdl, boost, hdf5, optimize, warning)	10m 51s
build_linux (ubuntu-22.04, gcc, openmp, python, gsl, ltdl, boost, optimize, warning)	18m 50s
build_linux (ubuntu-22.04, gcc, mpi, python, gsl, ltdl, boost, optimize, warning)	19m 34s
build_linux (ubuntu-22.04, gcc, openmp, mpi, python, gsl, ltdl, boost, hdf5, sionlib, libneurosim...	32m 26s
	1h 52m 35s

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