[IMP] stock_picking_batch: add "Scheduled Date" field

This commit adds a "Scheduled Date" field to the batch pickings. Logic
behind this date is a bit tricky:

1. If "Scheduled Date" is edited directly in batch then this date will
   also be applied to all of its picking's "Schedule Date"s.
2. If "Scheduled Date" is not edited directly in the batch, then this
   date will be the earliest date of its assigned pickings and pickings
   will maintain their original scheduled date' including if picking
   scheduled date is changed.
3. If "Scheduled Date" is not edited directly and all pickings are
   removed or there are none then date will default to no date.

First cut of test for scheduled_date logic has also been added. Update
will be needed for testing onchange logic since it is currently not
supported by the tests.Form due to M2M widget used with O2M picking_ids
(M2M widget is used for when doing a "Add a Line" transfer to a batch
in backend).

Additionally this commit adds the 'scheduled_date' and 'operation_type' to
the kanban view.

Part of "1. Improve Batch Pickings" specification of overall barcode app
improvements task.

Task: 1884520
Enterprise PR: odoo/enterprise#12086
Upgrade PR: odoo/upgrade#1569

Closes: odoo/odoo#55096

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