docs(samples): add samples to create, read, update, and delete products

[tetiana-karasova]

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Fixes #<issue_number_goes_here> 🦕

[snippet-bot]

Here is the summary of changes.

You are about to add 9 region tags.

• samples/interactive-tutorials/product/add_fulfillment_places.py:15, tag retail_add_fulfillment_places
• samples/interactive-tutorials/product/create_product.py:16, tag retail_create_product
• samples/interactive-tutorials/product/crud_product.py:16, tag retail_crud_product
• samples/interactive-tutorials/product/delete_product.py:16, tag retail_delete_product
• samples/interactive-tutorials/product/get_product.py:16, tag retail_get_product
• samples/interactive-tutorials/product/import_products_gcs.py:19, tag retail_import_products_from_gcs
• samples/interactive-tutorials/product/remove_fulfillment_places.py:15, tag retail_remove_fulfillment_places
• samples/interactive-tutorials/product/set_inventory.py:15, tag retail_set_inventory
• samples/interactive-tutorials/product/update_product.py:16, tag retail_update_product

You are about to delete 1 region tag.

• samples/interactive-tutorials/product/import_products_gcs.py:15, tag retail_import_products_from_gcs

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[parthea]

Hi @tetiana-karasova, Please could you help to resolve the conflicts?