MMM Data Generator

[juanitorduz]

Code to generate MMM data for parameter recovery.

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📚 Documentation preview 📚: https://pymc-marketing--2292.org.readthedocs.build/en/2292/

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PR Summary

Low Risk
Low risk documentation-only change that just adds a new gallery entry; primary risk is a broken image/link if the referenced assets are missing or renamed.

Overview
Adds a new MMM Fundamentals gallery card for Parameter Recovery, linking to ../notebooks/mmm/mmm_data_generator.html and using the mmm_data_generator.png thumbnail.

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[williambdean]

This is input data for MMMs. Would this make sense for the package and for people
testing their models? For example, pymc_marketing.mmm.testing module?

[juanitorduz]

This is input data for MMMs. Would this make sense for the package and for people testing their models? For example, pymc_marketing.mmm.testing module?

I thought to expose it first as notebook, adversise a bit and see it its useful (internally I agree would be very useful)