add neural solvers for paddle backend

[codecov[bot]]

Codecov Report

Merging #51 (691ec0a) into main (5571ef6) will decrease coverage by 0.01%. The diff coverage is 93.27%.

:exclamation: Current head 691ec0a differs from pull request most recent head 5c365f1. Consider uploading reports for the commit 5c365f1 to get more accurate results

@@            Coverage Diff             @@
##             main      #51      +/-   ##
==========================================
- Coverage   93.90%   93.89%   -0.01%     
==========================================
  Files          17       18       +1     
  Lines        6300     6634     +334     
==========================================
+ Hits         5916     6229     +313     
- Misses        384      405      +21     

Impacted Files	Coverage Δ
pygmtools/paddle_modules.py	85.49% <85.49%> (ø)
pygmtools/paddle_backend.py	96.92% <98.10%> (+0.37%)	:arrow_up:
pygmtools/utils.py	83.62% <0.00%> (-0.05%)	:arrow_down:
pygmtools/tensorflow_backend.py	95.35% <0.00%> (-0.02%)	:arrow_down:
pygmtools/jittor_backend.py	96.77% <0.00%> (-0.01%)	:arrow_down:
pygmtools/numpy_backend.py	97.31% <0.00%> (-0.01%)	:arrow_down:
pygmtools/pytorch_backend.py	97.18% <0.00%> (+0.22%)	:arrow_up:

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