cubicweb #13887276 dataimport extentity import should handle bytes attributes [validation pending]

And convert the value into a cubicweb.Binary.

prioritynormal
typeenhancement
done in3.23.0
load0.200
load left0.000
closed by#62a7100d774b [dataimport] Handle Bytes data in ExtEntity and convert them to Binary
patch[dataimport] Handle Bytes data in ExtEntity and convert them to Binary [applied]