Import scipy.special._cdflib in build

[rly]

Fix #720

The log says:

771 DEBUG: Collecting submodules for scipy.special.cython_special
1152 DEBUG: collect_submodules - scipy.special.cython_special is not a package.
1320 DEBUG: Collecting submodules for scipy.special._cdflib
1486 DEBUG: collect_submodules - scipy.special._cdflib is not a package

Alternative solution:

hiddenimports = [
    'email_validator',
    *collect_submodules('scipy.special'),
    *os.path.join(os.path.dirname(scipy.__file__), '.libs')
]

This results in many more imports:

680 DEBUG: Collecting submodules for scipy.special
186 DEBUG: collect_submodules - scanning (sub)package scipy.special
514 DEBUG: collect_submodules - scanning (sub)package scipy.special in location(s): ['/Users/rly/mambaforge/envs/nwb-guide/lib/python3.9/site-packages/scipy/special']
515 DEBUG: collect_submodules - scanning (sub)package scipy.special.tests
516 DEBUG: collect_submodules - scanning (sub)package scipy.special.tests in location(s): ['/Users/rly/mambaforge/envs/nwb-guide/lib/python3.9/site-packages/scipy/special/tests']
516 DEBUG: collect_submodules - scanning (sub)package scipy.special.tests.data
517 DEBUG: collect_submodules - scanning (sub)package scipy.special.tests.data in location(s): ['/Users/rly/mambaforge/envs/nwb-guide/lib/python3.9/site-packages/scipy/special/tests/data']
517 DEBUG: collect_submodules - scanning (sub)package scipy.special._precompute
517 DEBUG: collect_submodules - scanning (sub)package scipy.special._precompute in location(s): ['/Users/rly/mambaforge/envs/nwb-guide/lib/python3.9/site-packages/scipy/special/_precompute']
1405 DEBUG: collect_submodules - found submodules: ['scipy.special', 'scipy.special._add_newdocs', 'scipy.special._basic', 'scipy.special._cdflib', 'scipy.special._comb', 'scipy.special._ellip_harm', 'scipy.special._ellip_harm_2', 'scipy.special._lambertw', 'scipy.special._logsumexp', 'scipy.special._mptestutils', 'scipy.special._orthogonal', 'scipy.special._precompute', 'scipy.special._precompute.cosine_cdf', 'scipy.special._precompute.expn_asy', 'scipy.special._precompute.gammainc_asy', 'scipy.special._precompute.gammainc_data', 'scipy.special._precompute.lambertw', 'scipy.special._precompute.loggamma', 'scipy.special._precompute.struve_convergence', 'scipy.special._precompute.utils', 'scipy.special._precompute.wright_bessel', 'scipy.special._precompute.wright_bessel_data', 'scipy.special._precompute.wrightomega', 'scipy.special._precompute.zetac', 'scipy.special._sf_error', 'scipy.special._specfun', 'scipy.special._spfun_stats', 'scipy.special._spherical_bessel', 'scipy.special._support_alternative_backends', 'scipy.special._test_internal', 'scipy.special._testutils', 'scipy.special._ufuncs', 'scipy.special._ufuncs_cxx', 'scipy.special.add_newdocs', 'scipy.special.basic', 'scipy.special.cython_special', 'scipy.special.orthogonal', 'scipy.special.sf_error', 'scipy.special.specfun', 'scipy.special.spfun_stats', 'scipy.special.tests', 'scipy.special.tests.data', 'scipy.special.tests.test_basic', 'scipy.special.tests.test_bdtr', 'scipy.special.tests.test_boxcox', 'scipy.special.tests.test_cdflib', 'scipy.special.tests.test_cdft_asymptotic', 'scipy.special.tests.test_cosine_distr', 'scipy.special.tests.test_cython_special', 'scipy.special.tests.test_data', 'scipy.special.tests.test_dd', 'scipy.special.tests.test_digamma', 'scipy.special.tests.test_ellip_harm', 'scipy.special.tests.test_erfinv', 'scipy.special.tests.test_exponential_integrals', 'scipy.special.tests.test_faddeeva', 'scipy.special.tests.test_gamma', 'scipy.special.tests.test_gammainc', 'scipy.special.tests.test_hyp2f1', 'scipy.special.tests.test_hypergeometric', 'scipy.special.tests.test_kolmogorov', 'scipy.special.tests.test_lambertw', 'scipy.special.tests.test_log_softmax', 'scipy.special.tests.test_loggamma', 'scipy.special.tests.test_logit', 'scipy.special.tests.test_logsumexp', 'scipy.special.tests.test_mpmath', 'scipy.special.tests.test_nan_inputs', 'scipy.special.tests.test_ndtr', 'scipy.special.tests.test_ndtri_exp', 'scipy.special.tests.test_orthogonal', 'scipy.special.tests.test_orthogonal_eval', 'scipy.special.tests.test_owens_t', 'scipy.special.tests.test_pcf', 'scipy.special.tests.test_pdtr', 'scipy.special.tests.test_powm1', 'scipy.special.tests.test_precompute_expn_asy', 'scipy.special.tests.test_precompute_gammainc', 'scipy.special.tests.test_precompute_utils', 'scipy.special.tests.test_round', 'scipy.special.tests.test_sf_error', 'scipy.special.tests.test_sici', 'scipy.special.tests.test_specfun', 'scipy.special.tests.test_spence', 'scipy.special.tests.test_spfun_stats', 'scipy.special.tests.test_sph_harm', 'scipy.special.tests.test_spherical_bessel', 'scipy.special.tests.test_support_alternative_backends', 'scipy.special.tests.test_trig', 'scipy.special.tests.test_wright_bessel', 'scipy.special.tests.test_wrightomega', 'scipy.special.tests.test_zeta']

Generating the test data works fine with this change as well. It seems like we do not need to import all of these, but maybe it is better to preemptively include them just in case they are used by some other package?

App size is 1,379,222,782 bytes with importing just scipy.special._cdflib and 1,381,365,267 bytes importing all scipy.special, a difference of 2.14 MB.