[ADD] mail: add activities menu and views under Settings/Technical
[ADD] mail: add activities menu and views under Settings/Technical

closes odoo/odoo#32287

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