Add Monthly and At Shipping invoicing mode

The related PR on the OCA is

* OCA/account-invoicing#755

BSCOS-466

odoo/local-src/cosanum_account_invoice_mode/README.md

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+Cosanum Account Invoicing Mode
+==============================
+
+Cosanum customization for account invoicing modes.
+It adds a Lobster mode to send the e-invoice.

odoo/local-src/cosanum_account_invoice_mode/__init__.py

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+from . import models

odoo/local-src/cosanum_account_invoice_mode/__manifest__.py

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+# Copyright 2020 Camptocamp SA
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html)
+
+{
+    "name": "Cosanum Account Invoicing Mode",
+    "summary": "Cosanum customization for account invoicing modes.",
+    "version": "13.0.1.0.0",
+    "category": "Hidden",
+    "author": "Camptocamp",
+    "license": "AGPL-3",
+    "depends": [
+        "account_invoice_mode_at_shipping",
+        "stock_picking_group_by_partner_by_carrier",
+    ],
+    "website": "https://www.camptocamp.com",
+    "installable": True,
+}

odoo/local-src/cosanum_account_invoice_mode/models/__init__.py

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+from . import stock_picking

odoo/local-src/cosanum_account_invoice_mode/models/stock_picking.py

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+# Copyright 2020 Camptocamp SA
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html)
+
+from odoo import models
+
+
+class StockPicking(models.Model):
+    _inherit = "stock.picking"
+
+    def _get_sales_order_to_invoice(self):
+        """Get all sale order grouped in the picking."""
+        return self.sale_ids