[DOC] Add example for finding and reinstantiating flows

[Akarshkushwaha]

Metadata

• Reference Issue: Fixes Add the example on downloading reinstantiable flows #1166
• New Tests Added: NA (Example script added)
• Documentation Updated: Yes
• Change Log Entry: Added examples/Advanced/plot_reinstantiable_flows.py to demonstrate how to find and reinstantiate flows.

Details

• What does this PR implement/fix? Explain your changes.
  This PR adds a new example script examples/Advanced/plot_reinstantiable_flows.py that demonstrates:
  1. Listing flows from OpenML.
  2. Filtering for scikit-learn flows.
  3. Reinstantiating flows locally using openml.flows.get_flow(..., reinstantiate=True).
  4. Using the reinstantiated model object.
     This addresses the request in Add the example on downloading reinstantiable flows #1166 (and Finding all runs with flows that can be reinstantiated #1165).
• Why is this change necessary? What is the problem it solves?
  Users often want to find specific flows (e.g., sklearn ones) and run them locally. This example provides a clear, runnable script to show how to do this efficiently, including how to handle potential version mismatches (strict_version=False).
• How can I reproduce the issue this PR is solving and its solution?
  Run the new example script:

  python examples/Advanced/plot_reinstantiable_flows.py

[Akarshkushwaha]

Hi @PGijsbers @fkiraly , I have implemented the example as discussed in #1165 to resolve #1166.
It filters for newer flows (using offset) to ensure compatibility with the current openml-sklearn extension.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.13%. Comparing base (d18ca42) to head (e83d796).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1636      +/-   ##
==========================================
+ Coverage   52.08%   52.13%   +0.04%     
==========================================
  Files          36       36              
  Lines        4360     4360              
==========================================
+ Hits         2271     2273       +2     
+ Misses       2089     2087       -2     

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