[10.0][IMP] shopinvader: Allows to download paid invoices for confirmed sal…

[lmignon]

…e orders

In this change the invoices information are included into the sale order info And a new service allows to download the invoice document.

forward port from 9.0

to be merged with #327

[codecov-io]

Codecov Report

Merging #366 into 10.0 will decrease coverage by 0.06%.
The diff coverage is 84.21%.

@@            Coverage Diff             @@
##             10.0     #366      +/-   ##
==========================================
- Coverage   89.38%   89.31%   -0.07%     
==========================================
  Files         136      137       +1     
  Lines        3542     3614      +72     
==========================================
+ Hits         3166     3228      +62     
- Misses        376      386      +10

Impacted Files	Coverage Δ
shopinvader/services/abstract_mail.py	88.63% <ø> (-1.16%)	⬇️
shopinvader/services/service.py	77.5% <100%> (+1.5%)	⬆️
shopinvader/services/sale.py	97.61% <100%> (+0.84%)	⬆️
shopinvader/controllers/main.py	38.46% <60%> (+1.31%)	⬆️
shopinvader/services/invoice.py	81.81% <81.81%> (ø)
shopinvader/services/cart.py	87.93% <0%> (+0.12%)	⬆️
partner_contact_company/models/partner.py	79.41% <0%> (+1.47%)	⬆️
shopinvader/services/customer.py	89.47% <0%> (+1.75%)	⬆️

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[Cedric-Pigeon]

@lmignon Could you rebase this one please? #327 is merged.

[lmignon]

@Cedric-Pigeon rebase done

[lmignon]

/ocabot merge minor

[shopinvader-git-bot]

This PR looks fantastic, let's merge it!
Prepared branch 10.0-ocabot-merge-pr-366-by-lmignon-bump-minor, awaiting test results.

[shopinvader-git-bot]

Congratulations, your PR was merged at b3157b4. Thanks a lot for contributing to shopinvader. ❤️