[14.0] Add lines management to create multiline invoices

[MTantin]

Multiline invoice creation is not supported yet.

I propose those modifications to accept multiline creation.

Invoice2data library accept format (with parser or not) to extract invoice line by line with regex.
the result is stored in "lines" field as json list.
I iterate over this list to prepare data for account_invoice_import submodule.

[OCA-git-bot]

Hi @alexis-via,
some modules you are maintaining are being modified, check this out!

[bosd]

Thanks for this PR. We're working on the same functionality.
See PR: #573
However, mine does not include tests. Bu thas more doc's and fields.
Would you like to contribute your code to that pr? Or leave a review?

[bosd]

Oops, made the same comment on your previous PR.
Why did you open a new one?

[bosd]

Import is failling as there is no known template found for Gandi.
Can you share your template file?

[MTantin]

Here is our template for Gandi's invoices

# -*- coding: utf-8 -*-
issuer: Gandi
fields:
  amount: Total \(EUR\)\s+(-?\d+,?\.?\d+)
  amount_untaxed: Sous-total\s+(-?\d+,?\.?\d+)
  date: Facture\s+n\°\s+(\d{8})
  invoice_number: Facture\s+n\°\s+(\d+)
  vat: TVA ([a-zA-Z]{2}\d+)
  partner_name: Gandi
  siren: SIRET\s+(\d{3}\s*\d{3}\s*\d{3})
  lines:
    parser: lines
    start: Produit\s+Description\s+Propriétaire\s+Taxes\s+Prix
    end: Répartition
    line: (?P<name>.+)\s{2,}(?P<taxes>\d+)%\s{2,}(?P<price_unit>-?\d+,\d+)\s+€
    types:
      price_unit: float
      taxes: float
keywords:
  - Gandi SAS
  - SIRET 423 093 459 00042
options:
  currency: EUR
  date_formats:
      - '%Y%m%d'
  languages:
    - fr
  decimal_separator: ','

[github-actions]

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