cubicweb #2847151 adapt schema serialization to allows custom type [validation pending]

Yams is gaining new final type feature. The cubicweb scherialization proces need adaptation

priorityimportant
typeenhancement
done in3.17.0
load4.000
load left0.000
closed by#ba9e3fbfa5a5 [schemaserial] serialize additional yams parameter for customs type
patch[schemaserial] Keep the additional parameters of additional base types in a specific Bytes field of CWAttribute [applied]