[IMP] stock{_account}: inventory => locations report update

Inventory report has been updated to have:
- better applicability: report renamed to "Locations" and is only
  visible w/Locations, Consignment, or debug mode active
- improved UX: list view rearranged, buttons added, grouping removed,
  sums added to bottom of list
- improved quant "Value": instead of the accounting value, this is now
  the average unit cost (i.e. sum(valuation layer values)/sum(valuation
  layer quantities) per product x on hand qty (of quant).
- single click load for products
- search based on Warehouse option (including storing
  location.warehouse_id to avoid overly complex search function)
- always show "Location" column in this view even if multi-locations is
  not active

"inventory report" part of b2b task: 2882539

Upgrade PR: odoo/upgrade#3819

Part-of: odoo/odoo#97109