Add `eprop_iaf_psc_delta_adapt` #319

Job	Run time
clang-format	23s
copyright_headers	23s
black	31s
cppcheck	6m 49s
flake8	23s
forbidden_types	16s
isort	15s
lychee_IGNORED	24s
mypy	35s
pydocstyle	21s
pylint	40s
rstcheck	26s
unused_names	16s
vale	34s
sphinx-rtd	3m 53s
sphinx-conda	0s
build_macos (macos-latest, clang, openmp, mpi, python, gsl, ltdl, boost, hdf5, optimize, warning)	10m 57s
build_linux (ubuntu-22.04, gcc, boost, optimize, warning)	14m 13s
build_linux (ubuntu-22.04, gcc, openmp, python, gsl, ltdl, boost, optimize, warning)	20m 10s
build_linux (ubuntu-22.04, gcc, mpi, python, gsl, ltdl, boost, optimize, warning)	22m 16s
build_linux (ubuntu-22.04, gcc, openmp, mpi, python, gsl, ltdl, boost, hdf5, sionlib, libneurosim...	32m 39s
	1h 56m 24s

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