Uploads a file to a Synapse managed S3 storage. This is the preferred function for uploading files to Tables
synUploadSynapseManagedFileHandle(path, storageLocationId=NULL, mimetype=NULL)
path to the file
storageLocationId of a S3 storage location. pass in a value if you wish to use an ExternalS3StorageLocation
MIME type of the file, if known.
a new FileHandle (the metadata for the uploaded file) as a named list