delivery_package_number

Restores editable package-count tracking on stock pickings so delivery flows can leverage it for shipping operations.

Key Features

stock.picking: Adds a stored number_of_packages field that auto-counts related delivery packages while remaining manually editable.
stock.picking: Computes an ask_number_of_packages flag and blocks validation with a wizard when package counts are required.
stock.number.package.validate.wizard: Allows users to assign package counts to one or multiple pickings, validate them, and optionally print package labels.
stock.picking.type: Introduces settings to skip or force the package-count wizard and to configure which label report is used.
stock.backorder.confirmation: Ensures backorder processing avoids automatic package assignment so manual package counts persist.
reports: Provides a printable package label report with a dedicated paper format for per-package numbering.