add shellcheck and pre-commit to CI jobs #330

Job	Run time
clang-format	28s
cppcheck	3m 33s
pre-commit-hooks	1m 12s
shellcheck	17s
copyright_headers	14s
forbidden_types	16s
black	43s
isort	11s
lychee_IGNORED	27s
mypy	34s
pydocstyle	18s
pylint	37s
rstcheck	22s
unused_names	14s
vale	30s
flake8	22s
build_linux (ubuntu-20.04, gcc, boost, optimize, warning)	11m 36s
build_linux (ubuntu-20.04, gcc, openmp, python, gsl, ltdl, boost, optimize, warning)	15m 42s
build_macos (macos-latest, clang, openmp, mpi, python, gsl, ltdl, boost, hdf5, optimize, warning)	30m 55s
build_linux (ubuntu-20.04, gcc, mpi, python, gsl, ltdl, boost, optimize, warning)	17m 2s
build_linux (ubuntu-20.04, gcc, openmp, mpi, python, gsl, ltdl, boost, hdf5, sionlib, libneurosim...	22m 54s
sphinx-rtd	5m 19s
sphinx-conda	0s
	1h 53m 46s

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