add stock_inventory_product_exhausted: prevent for removing zero quantity stock quants. Add exhausted products to inventory adjustments

stock_inventory_product_exhausted/readme/USAGE.rst

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+To use this module:
+
+#. Go to **Inventory > Operations > Inventory Adjustments**
+#. Create a new inventory adjustment
+#. Configure the desired locations and product selection
+#. **Enable** the "Include Exhausted Products" field if you want to include products without stock
+#. Click on "Start Inventory"
+
+Use cases
+---------
+
+**With the field enabled:**
+
+* Zero quantity quants will be created for products that have no stock in the selected locations
+* Allows physically counting products that are exhausted in the system
+* Useful for complete inventories where you want to verify that there really is no stock of certain products
+
+**With the field disabled:**
+
+* Standard behavior of the original module
+* Only products that already have existing quants are included