Add neural solvers & auto examples for paddle backend

[wzever]

No description provided.

[codecov]

Codecov Report

Merging #52 (6136ff6) into main (5571ef6) will increase coverage by 0.04%.
The diff coverage is 92.66%.

@@            Coverage Diff             @@
##             main      #52      +/-   ##
==========================================
+ Coverage   93.90%   93.94%   +0.04%     
==========================================
  Files          17       18       +1     
  Lines        6300     6660     +360     
==========================================
+ Hits         5916     6257     +341     
- Misses        384      403      +19     

Impacted Files	Coverage Δ
pygmtools/neural_solvers.py	89.05% <ø> (ø)
pygmtools/pytorch_backend.py	96.97% <60.00%> (+0.01%)	⬆️
pygmtools/numpy_backend.py	97.10% <66.66%> (-0.22%)	⬇️
pygmtools/paddle_modules.py	85.60% <85.60%> (ø)
pygmtools/paddle_backend.py	96.94% <98.13%> (+0.39%)	⬆️
pygmtools/jittor_backend.py	96.79% <100.00%> (+0.01%)	⬆️
pygmtools/utils.py	85.28% <100.00%> (+1.61%)	⬆️

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[rogerwwww]

Nice work! merged.