[IMP] base_comment_template multi company rules

[IMP] Move comment_template_id from account_invoice_comment_template and make it company_dependant

[IMP] base_comment_template: Add test

base_comment_template/models/res_partner.py

@@ -0,0 +1,19 @@
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from odoo import api, fields, models
+
+
+class ResPartner(models.Model):
+    _inherit = "res.partner"
+
+    property_comment_template_id = fields.Many2one(
+        comodel_name='base.comment.template',
+        string='Conditions template',
+        company_dependant=True,
+    )
+
+    @api.model
+    def _commercial_fields(self):
+        res = super(ResPartner, self)._commercial_fields()
+        res += ['property_comment_template_id']
+        return res