[ADD] core: support for parent.xxx in modifiers of o2m sub-fields
[ADD] core: support for parent.xxx in modifiers of o2m sub-fields

closes odoo/odoo#34699

Signed-off-by: Xavier Morel (xmo) <0f311f41b2be8e2b5de98776566d712cdc154ca4@odoo.com>
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo