[18.0][ADD] stock_orderpoint_variant_mto_as_mts

[henrybackman]

Glue module between stock_orderpoint_mto_as_mts and product_variant_route_mto to trigger reordering rules for product variants

Depends on:

• [18.0][FIX] product_variant_route_mto: add missing inverse product-attribute#2131

[henrybackman]

@jbaudoux Could you check if I've implemented this glue module according to the specifications or why the tests are failing? Adding this module breaks multiple other tests for other modules but I wasn't able to pinpoint a clear reason for this to propose a fix.

[sebalix]

Empty file to remove (same for USAGE.md)

[jbaudoux]

@henrybackman There should be one last test failing. I added this https://github.com/camptocamp/stock-logistics-orderpoint/blob/ea5fb1aadd5144aeac8425074563c691988a9866/stock_orderpoint_variant_mto_as_mts/models/stock_route.py

[henrybackman]

@henrybackman There should be one last test failing. I added this https://github.com/camptocamp/stock-logistics-orderpoint/blob/ea5fb1aadd5144aeac8425074563c691988a9866/stock_orderpoint_variant_mto_as_mts/models/stock_route.py

@jbaudoux There's 4 tests still failing