[16.0][ADD] stock_move_line_picking_partner

[marcos-mendez]

This module stores stock.move.line.picking_partner_id and exposes it in the
move line tree and search views.

It allows users to:

• display the picking partner on moves history,
• search stock move lines by picking partner,
• group stock move lines by picking partner.

Technical rationale:

• picking_partner_id already exists in core as a related field,
• this addon stores/indexes it and exposes it in the main move history list/search.

Tests cover:

• stored related field value,
• search by picking partner,
• grouping by picking partner.

[marcos-mendez]

@pedrobaeza When the tests don't pass but is nothing related to my module, should i start working on others work or just wait for the PR to be reviewed by someone even tough it has nothing to be related on?

[pedrobaeza]

Contact the authors/contributors of the module in a issue to notify the problem. Anyway, sometimes is something due to the hour of the tests. Try again to check if it's the case.