FIX include 'n' field in 1D/2D list + remove singleton dimension in 1D dict

[lostanlen]

Fix #875, Fix #895
as discussed in today's Kymatio meeting

NB: these changes must be in the release notes.

[codecov-commenter]

Codecov Report

Merging #900 (eee8d2e) into dev (511f1c3) will increase coverage by 0.04%.
The diff coverage is 82.71%.

@@            Coverage Diff             @@
##              dev     #900      +/-   ##
==========================================
+ Coverage   88.14%   88.18%   +0.04%     
==========================================
  Files          64       73       +9     
  Lines        2226     2294      +68     
==========================================
+ Hits         1962     2023      +61     
- Misses        264      271       +7     

Flag	Coverage Δ
jenkins_main	88.18% <82.71%> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
kymatio/frontend/entry.py	100.00% <ø> (ø)
kymatio/frontend/numpy_frontend.py	93.33% <ø> (-0.42%)	⬇️
kymatio/jax.py	0.00% <0.00%> (ø)
kymatio/scattering1d/frontend/numpy_frontend.py	70.27% <0.00%> (+1.84%)	⬆️
...matio/scattering1d/frontend/tensorflow_frontend.py	71.05% <0.00%> (+1.82%)	⬆️
kymatio/scattering2d/core/scattering2d.py	100.00% <ø> (ø)
kymatio/backend/numpy_backend.py	97.56% <50.00%> (-2.44%)	⬇️
kymatio/backend/jax_backend.py	90.00% <90.00%> (ø)
kymatio/frontend/jax_frontend.py	100.00% <100.00%> (ø)
kymatio/scattering1d/backend/jax_backend.py	100.00% <100.00%> (ø)
... and 9 more

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[MuawizChaudhary]

@changhongw If you approve pls press the big green button!

[changhongw]

Thanks for noticing this problem!