[16.0][ADD] stock_picking_accounting_date

[AungKoKoLin1997]

This module adds accounting date in picking and pass the value to accounting date of SVL's journal entry.

When a user makes the transfer for the products with "real time" inventory valuation, effective date in transfer couldn't be selected.
And Accounting date for stock valuation journal entry will be the same with effective date.
So, for the users who want to specify each transfer's actual accounting date needs to reset to draftmanually and
change acocunting date. This module intends to get rid of this inconvenience by adding accounting date in transfer and pass to journal entry.

@qrtl

[yostashiro]

@AungKoKoLin1997 I don't think this module should belong here. Maybe https://github.com/OCA/stock-logistics-warehouse?

[AungKoKoLin1997]

I don't think this module should belong here. Maybe https://github.com/OCA/stock-logistics-warehouse?

@yostashiro I found modules like stock_picking_invoicing_incoterm is in this repo and I propose this PR. I also know module like account_move_line_stock_info exist in stock-logistics-warehouse repo. That's why I thought this module can host in this repo.

[AungKoKoLin1997]

This module was proposed to stock-logistics-warehouse.
OCA/stock-logistics-warehouse#1711