feat(medusa): Align product import and export (#2471)

**What**

Create a data structure that facilitate the addition of new column descriptor for both export and import and ensure that the column name is shared between bother import and export to facilitate the import with an exported file. 

**Tests**

Add an additional integration tests that export a file, update the data, and re import the same file

FIXES CORE-716
FIXES CORE-713

.changeset/rotten-squids-arrive.md

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+"@medusajs/medusa": minor
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+feat(medusa): Align columns between product import/export, re visit the way the columns are defined and treated