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to stream data from disk when possible
#3322
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Implements #2690, as a second attempt at #2774. Defers reading from paths/files until the data is actually needed, which improves the performance of multipart file uploads by streaming directly from disk instead of copying into memory first. Cases where the file is included as a base64 string in the json payload are unaffected since the data needs to be encoded and written into the payload.