Tag select

[claudiulodro]

Add an option to the Edit Mode of the products block for searching and selecting products by tag. This is similar to the product category search and select feature we already have built out for the Products block, but for tags. We may want to make some sort of reusable component that we can use for all of these features.

This feature isn't in the current design for the block, but I'm leaving this open in case it gets added later or that was an oversight.