[IMP] Inventory: Rewrite aging report as stock valuation report

[benderliz]

This doc has been rewritten to address the following:

• The Inventory Aging Report doc is no longer needed because this report was combined into the Stock Valuation Report (in the pivot view).
• The Stock Valuation Report, by default, is in list view. This doc overwrites the Inventory Aging Report to instead focus primarily on the Stock Valuation Report list view, including all the updated/new fields shown in this view.
• Parts of the former Inventory Aging Report are still covered in the Stock Aging Report section.
• A section was added to described the graph view of this report.
• A few other sections were added to describe important contextual information about stock valuation and how it is calculated (e.g. perpetual vs. periodic accounting, SVLs)

Odoo Project task # 4320416

[robodoo]

[benderliz]

Hi @dikd-odoo! This PR is ready for a first-round peer review. Thank you! 👯

[benderliz]

Hi @dikd-odoo! This PR is ready for a first-round peer review. Thank you! 👯

Hi @dikd-odoo - I am noticing a lot of little rendering issues in the runbot. Please hold off on this...will try to resolve these now and push up a new commit! Stay tuned B)

[benderliz]

Note to @dikd-odoo and to self - I see in the runbot I need to edit the graph icon's guilabel!