[massive store] Store entities in temporary table as well
* on some entity type is encountered by a slave, create a dedicated table for
insertion of entities of this type by this slave, similarly to what is done
for relation - this should lower changes of conflicts in master/slaves mode ;
* delay drop of constraints and indexes to `finish` method, where copy from
temporary tables to regular table is done ;
* insertion of metadata is done by scanning temporary tables, which may be way
shorter than theier associated regular table ;
* drop drop_metadata_constraints with its constraint_dropped friend attribute,
there are no more necessary since this is done once in the `finish`.
Related to #15538303
include *.py
include */*.py
recursive-include cubicweb_%(cubename)s *.py
recursive-include cubicweb_%(cubename)s/data *.gif *.png *.ico *.css *.js
recursive-include cubicweb_%(cubename)s/i18n *.po
recursive-include cubicweb_%(cubename)s/wdoc *
recursive-include test/data bootstrap_cubes *.py
include tox.ini
recursive-include debian changelog compat control copyright rules
include cubicweb-%(cubename)s.spec