[ADD] sale_order_rental_stock_forecast: Scheluded for generate "produ…

[alfredoavanzosc]

…ct st ock forecast", modified to search the biggest "expected end date" of the sales orders.

[alfredoavanzosc]

Para que pasen los test de este módulo, se deben de mergear antes los siguientes PR,s:
1.- #50
2.- avanzosc/odoo-addons#762

[codecov]

Codecov Report

Merging #52 into 12.0 will decrease coverage by 0.12%.
The diff coverage is 95.23%.

@@            Coverage Diff             @@
##             12.0      #52      +/-   ##
==========================================
- Coverage   98.53%   98.41%   -0.13%     
==========================================
  Files          33       35       +2     
  Lines         547      568      +21     
==========================================
+ Hits          539      559      +20     
- Misses          8        9       +1

Impacted Files	Coverage Δ
...e_order_rental_stock_forecast/models/sale_order.py	100% <100%> (ø)
..._forecast/models/product_product_stock_forecast.py	91.66% <91.66%> (ø)

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