Relevant Issue: https://sagebionetworks.jira.com/browse/PLFMPLFM-4253

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StorageLocationSettings are immutable and thus can be cached client side. The information in these will therefore not be repeated in the new implementations of UploadDestination and FileHandle.The keyPath in ClientDelegatedS3UploadDestination is client generated: baseKey/<<UUID>>

keyPrefixUUID is a new UUID generated by the backend every time a ExternalObjectStoreUploadDestination is requested.

The key in ClientDelegatedS3FIleHandleExternalObjectStorageFileHandle, once uploaded will be baseKey/<<UUID>>keyPrefixUUID/fileName.

New API

Because the upload must occur client-side, the client must be The clients are responsible for creating the FIleHandle once uploading has completedFileHandles after upload has completed since Synapse does not have access to the new storage location

With the changes to the hierarchy of FileHandle, the POST /externalFileHandle service will be made generic to allow all implementations of ExternalFileHandleInterface