Add models with exact and simplified NMDA dynamics according to Brunel and Wang (2001) #5472

Job	Run time
copyright_headers	17s
clang-format	21s
cppcheck	7m 15s
forbidden_types	16s
lychee_IGNORED	22s
mypy	37s
pydocstyle	33s
rstcheck	29s
unused_names	18s
black	31s
flake8	23s
isort	10s
pylint	38s
vale	33s
sphinx-rtd	3m 42s
sphinx-conda	0s
build_linux (ubuntu-22.04, gcc, boost, optimize, warning)	12m 23s
build_macos (macos-latest, clang, openmp, mpi, python, gsl, ltdl, boost, hdf5, optimize, warning)	10m 34s
build_linux (ubuntu-22.04, gcc, openmp, python, gsl, ltdl, boost, optimize, warning)	17m 48s
build_linux (ubuntu-22.04, gcc, mpi, python, gsl, ltdl, boost, optimize, warning)	18m 19s
build_linux (ubuntu-22.04, gcc, openmp, mpi, python, gsl, ltdl, boost, hdf5, sionlib, libneurosim...	31m 57s
	1h 47m 26s

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