Extension support for storage adapters

Note: I am quite new to the Directus world, so I might not have the big picture. Here under is my contribution to start the discussions, and maybe end up to a design that could lead to an implementation. Please excuse me, and correct me, if some information are wrong. Purpose Question about extension support for storage adapters has been coming and going without reaching a critical mass. This discussion aims to gather the question to be answered, a tour of the existing features and how to build this without leveraging the risk of breaking changes in the future. Main topics The following topic need to be addressed before thinking about implementation • What does a storage adapter class look like? What is to be kept ? • Folder support: how to handle the Directus Folder information in the Storage Adapter? • Custom file naming: how to manage naming conflicts? • File duplication handling: is this the responsibility of Directus Core or the Storage Adapt…