Add description and hash fields to media asset

[lenaorobei]

Story https://github.com/magento/adobe-stock-integration/issues/724: User edits image meta data in Media Gallery https://github.com/magento/adobe-stock-integration/issues/1183: Magento extracts image meta data from file

Description

• hashvarchar and description text fields have to be added to the app/code/Magento/MediaGallery/etc/db_schema.xml in magento2 repo
• db_schema_whitelist.json should be updated accordingly (see documentation)
• getHash(): string and getDescription(): string methods should be added to the \Magento\MediaGalleryApi\Api\Data\AssetInterface
• getHash(): string and getDescription(): string methods implementation should be added to the \Magento\MediaGallery\Model\Asset ($description and $hash last optional constructor parameters should be added)
• The related existing tests should be upaded to cover the new fileds

[m2-assistant[bot]]

Hi @lenaorobei. Thank you for your report. To help us process this issue please make sure that you provided sufficient information.

Please, add a comment to assign the issue: @magento I am working on this

---

• Join Magento Community Engineering Slack and ask your questions in #github channel.