cubicweb #3799036 deprecate get/set_shared_data [validation pending]

We now have clear session and transaction data.

prioritynormal
typeenhancement
done in3.19.2
load0.200
load left0.000
closed by#b7b71be569cf deprecate get/set_shared_data API
patchdeprecate get/set_shared_data API [applied]deprecate get/set_shared_data API [rejected]