[ADD] mrp_packaging_default: product packaging data in MRP

This module allows and encourages the use of packaging within MRP, both to manufacture products or to create kits.

@moduon MT-4506

mrp_packaging_default/readme/CONFIGURE.md

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+To see the effects of this module, you need to:
+
+1. Go to *Settings*.
+2. Activate *Inventory > Products > Product Packagings*.
+3. Optionally, activate also *Units of Measure*. This is not required, but if
+   you are interested in this module, it's probably because you use this.
+4. Save.

mrp_packaging_default/readme/CONTEXT.md

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+In certain businesses, it is important to know the packaging you will use to
+manufacture a product. Example: food wholesale companies.
+
+For example, imagine you want to create a food basket that includes, among
+other things, 1 kg of cheese. It is not the same to put it in small sliced and
+vacuum-packed 100g packages as it is to put a whole cheese ball. Even when the
+product and the total weight are the same: 1kg of cheese.
+
+If you are interested in this module, you may also be interested in
+`sale_packaging_default`.

mrp_packaging_default/readme/CONTRIBUTORS.md

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+-   Jairo Llopis ([Moduon](https://www.moduon.team/))

mrp_packaging_default/readme/DESCRIPTION.md

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+This module allows and encourages the use of packaging within MRP, both to
+manufacture products or to create kits.

mrp_packaging_default/readme/USAGE.md

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+Some component products must exist. Those components will be later included in the manufactured or kit product. Then, you'll notice the module effects.
+
+To create the component products:
+
+1. Go to *Inventory > Products > Products*.
+2. Create a product.
+3. Configure its unit of measure (if you enabled that option).
+4. Add some line(s) in *Inventory > Packaging*.
+
+To use this module with **a kit of products**, you need to:
+
+1. Go to *Inventory > Products > Products*.
+2. Create a product that will be the kit.
+3. Set *Product Type* "Consumable".
+4. Configure its unit of measure (if you enabled that option).
+5. Enable *Inventory > Operations > Routes > Manufacture*.
+7. Click on *Bill of Materials* button and create a new one.
+8. Set *BoM Type* "Kit".
+9. Configure the rest of the BoM. When you configure the component lines, use
+   the new *Packaging* and *Packaging Qty* fields.
+10. Go to *Inventory > Delivery Orders (three dots) > New > Planned Transfer*.
+11. Fill the *Delivery Address*.
+12. Add one *Operations* line with the kit product you just created.
+13. Click on *Mark as TODO*.
+14. You will notice that the kit has been replaced by its components, and each
+    component line includes the packaging and its qty, just like you configured
+    them in the BoM.
+
+To use it with **a manufactured product**, instead:
+
+1. Go to *Inventory > Products > Products*.
+2. Create a product; the one that will be manufactured.
+3. Set *Product Type* "Storable Product".
+4. Configure its unit of measure (if you enabled that option).
+5. Enable *Inventory > Operations > Routes > Manufacture*.
+7. Click on *Bill of Materials* button and create a new one.
+8. Set *BoM Type* "Manufacture this product".
+9. Configure the rest of the BoM. When you configure the component lines, use
+   the new *Packaging* and *Packaging Qty* fields.
+10. Go back to the product form.
+11. Click on *Reordering Rules* button and create a new one.
+12. Set some minimal and maximal quantities.
+13. Click on *Order Once*. If you don't see this button, you can also go to
+    *Inventory > Operations > Run Scheduler > Run Scheduler*.
+14. Go to *Manufacturing > Operations > Manufacturing Orders*. You will see a
+    new MO created from the reordering rule. Open it.
+15. See how the *Components* lines contain packaging information, just like you
+    defined it in the BoM. The same would happen if you created the MO
+    manually.