[IMP]bi_sql_editor: add parent menu as an editable parameter when creating UI elements

When creating the UI for the SQL view, it is now possible to set a specific Parent Menu which will be used when creating the UI Menu for the report itself. The default value will be the `SQL Reports` menu.
Also, added the explanation on the `CONFIGURE.rst` file to have the description updated.

bi_sql_editor/models/bi_sql_view.py

@@ -162,7 +162,31 @@ class BiSQLView(models.Model):
     model_id = fields.Many2one(
         string="Odoo Model", comodel_name="ir.model", readonly=True
     )
+    # UI related fields
+    # 1. Editable fields, which can be set by the user (optional) before
+    # creating the UI elements
 
+    @api.model
+    def _default_parent_menu_id(self):
+        return self.env.ref("bi_sql_editor.menu_bi_sql_editor")
+
+    parent_menu_id = fields.Many2one(
+        string="Parent Odoo Menu",
+        comodel_name="ir.ui.menu",
+        required=True,
+        readonly=True,
+        default=lambda self: self._default_parent_menu_id(),
+        states={
+            "draft": [("readonly", False)],
+            "sql_valid": [("readonly", False)],
+            "model_valid": [("readonly", False)],
+        },
+        help="By assigning a value to this field before manually creating the "
+        "UI, you're overwriting the parent menu on which the menu related to "
+        "the SQL report will be created.",
+    )
+
+    # 2. Readonly fields, non editable by the user
     tree_view_id = fields.Many2one(
         string="Odoo Tree View", comodel_name="ir.ui.view", readonly=True
     )
@@ -540,7 +564,7 @@ class BiSQLView(models.Model):
         self.ensure_one()
         return {
             "name": self.name,
-            "parent_id": self.env.ref("bi_sql_editor.menu_bi_sql_editor").id,
+            "parent_id": self.parent_menu_id.id,
             "action": "ir.actions.act_window,%s" % self.action_id.id,
             "sequence": self.sequence,
         }