2021-07-12-added-cross-selling-import-export-profile.md

title	issue	author	author_email	author_github
Added cross-selling import-export profile	NEXT-16042	d.neustadt	[email protected]	dneustadt

Core

• Added migration for cross-selling import/export profile
• Added ProductCrossSellingSerializer for resolving assigned products from string
• Changed custom id conversion to be included in deserialization through FieldSerializer

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Administration

• Added specific resolver for one-to-many assignedProducts field of product_cross_selling in field mapping