cubicweb #1550045 add find_entities() and find_one_entity() to session API [resolved]

usage would be find_entities('Ticket', priority=u'normal') or find_one_entity('CWGroup', name=u'users')

prioritynormal
typeenhancement
done in3.11.2
load left0.000
closed by#dfd4680a23f0 [session] add find_entities and find_one_entity to session/request API (closes #1550045)