Example notebook for Retail and Consumer Packaged Goods industry (#366)

* Added CPG supply chain dbldatagen notebook

* Deleting original CPG_supply_chain_datagen.py notebook

* Adding new file with the changes

Adding new file in the correct location in the repo.

* Cleaned up comments

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Co-authored-by: Greg Hansen <163584195+ghanse@users.noreply.github.com>

Author: Adamdion