Re-organise tripartite connectivity generation to support multiple primary connection rules #5600

Job	Run time
clang-format	17s
copyright_headers	16s
cppcheck	7m 14s
forbidden_types	15s
lychee_IGNORED	26s
pydocstyle	24s
rstcheck	23s
unused_names	18s
vale	30s
black	31s
flake8	20s
isort	14s
mypy	40s
pylint	35s
sphinx-rtd	3m 11s
sphinx-conda	0s
build_macos (macos-latest, clang, openmp, mpi, python, gsl, ltdl, boost, hdf5, optimize, warning)	12m 5s
build_linux (ubuntu-22.04, gcc, boost, optimize, warning)	13m 28s
build_linux (ubuntu-22.04, gcc, openmp, python, gsl, ltdl, boost, optimize, warning)	18m 35s
build_linux (ubuntu-22.04, gcc, mpi, python, gsl, ltdl, boost, optimize, warning)	20m 17s
build_linux (ubuntu-22.04, gcc, openmp, mpi, python, gsl, ltdl, boost, hdf5, sionlib, libneurosim...	31m 30s
	1h 51m 29s

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