[GSoC 2025] Example notebook for custom model serialisation

[medha-14]

Description

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Fixes # (issue)

Type of change

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Important checks:

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• No style issues: nox -s pre-commit
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• The documentation builds: nox -s doctests
• Code is commented for hard-to-understand areas
• Tests added that prove fix is effective or that feature works

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Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 98.79%. Comparing base (327948a) to head (b616278). :warning: Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5170      +/-   ##
===========================================
+ Coverage    98.78%   98.79%   +0.01%     
===========================================
  Files          320      320              
  Lines        27075    27092      +17     
===========================================
+ Hits         26745    26766      +21     
+ Misses         330      326       -4     

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