Move gRPC module to new repository

[magento-engcom-team]

AC:

• Magento\Grpc module moved from https://github.com/magento/catalog-storefront/tree/develop/app/code/Magento/Grpc to new https://github.com/magento-commerce/module-grpc
• DevBox updated in order to install moved module and run it
• Documents with required repo updated and include gRPC module repo
• build must be properly set up to use new repo for test run

[magento-engcom-team]

The issue was exported from the internal JIRA. The link to the original JIRA issue: https://jira.corp.magento.com/browse/SFAPP-130

[m2-assistant[bot]]

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