[ADD] core: new magical `odoo.upgrades` package
[ADD] core: new magical `odoo.upgrades` package

This package point to first package found in `upgrades_paths` or
fallback to alias of legacy `odoo.addons.base.maintenance.migrations`.

closes odoo/odoo#32650

Signed-off-by: Christophe Simonis <0e117f2b429bfa19751522a564765b352cb7b946@odoo.com>
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo