[IMP] mrp, sale_mrp: kits quantities

**Before this PR:**

- The quantities available when a kit was ordered was 0 even if enough components were available
- The quantities delivered when a kit was ordered were correct only if all move from the picking of its sale order were done. So the quantities delivered were correct only if all components were fully delivered.

**After this PR:**
- The number of kits available is computed based on the quantities available of the components needed to make the kit.
- The number of kits delivered is computed based on how many kits it's possible to make with the components already processed.
- Some test case are added the check the flows when kits are ordered.
Those test case make sure that:

  * Delivered quantities are accurate if :
     - kits in kit
     - backorders are made
     - returns are made
     - returns of returns are made
     - Multiple differents UoMs are setted on the components of a kit

  * Available quantities are accurate if:
     - Kits in kit
     - Multiple differents UoMs are setted on the components of a kit

TaskID : 1915370

closes odoo/odoo#29270

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