[REF] stock: quant: use `in_date` field

Set the `in_date` field to now when creating a tracked quant.
Set the correct `in_date` field when moving a quant (this is done by
adding a kw argument to `_update_available_quantity` and adapting the
code that moves quant in stock.move.line).

If quants from the same lot go together in the same location, we merge
them and keep the older date (as the user will have no way to tell the
difference anyway).

We add multiple test cases:
    - `in_date` are only set on tracked quants
    - FIFO and LIFO are correctly applied
    - keep the oldest `in_date` when merging quants
    - editing a done move line or creating one in a done picking is
      correctly working

Joint work with sle-odoo.

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