new task: fire custom event or product/variant change #300
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Expanded version of #187 to include product attributes as well. To handle this in an efficient manner, a decision was made to use the GraphQL representation of products and variants instead of using chained lookups of REST resources. Also, switched to using a hashed snapshot of the values and storing them in the cache for performance reasons, which also avoids firing a another product update event by updating a metafield.
This precludes the ability to monitor metafields, among other things, but as a demo task it covers a good deal of the available data on those resources.