[Documentation] Update NumPy notebooks and add PyTorch examples

[Microno95]

• Updates pre-existing notebooks and expands them to include a comparison with scipy.integrate.solve_ivp.
• Adds example notebooks for PyTorch backend, should include one reproduction of a numpy example and one Neural Network example.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 98.14815% with 1 line in your changes missing coverage. Please review.

Project coverage is 91.01%. Comparing base (c82174b) to head (2a567ec).

Files with missing lines	Patch %	Lines
desolver/integrators/integrator_template.py	97.61%	0 Missing and 1 partial ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master       #6      +/-   ##
==========================================
+ Coverage   90.84%   91.01%   +0.17%     
==========================================
  Files          22       22              
  Lines        2337     2315      -22     
  Branches      335      334       -1     
==========================================
- Hits         2123     2107      -16     
+ Misses        145      139       -6     
  Partials       69       69              

Flag	Coverage Δ
pr-tests-	?
pr-tests-test/notebooks	91.01% <98.14%> (?)

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