hooks: Allow pre-create to change upload ID, meta data and storage details #962
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This PR adds a method for v2 to overwrite the upload ID and meta data from the pre-create hook. No other hooks can perform these changes later on and only a selected set of properties can be overwritten. We also add the ability to pass storage details to data stores to influence file names, for example, although no data store implements this yet.
Context and previous work, which this PR is based on: