[FIX] mrp_account: access to BOM

- Install MRP and Accounting
- Create a user with only 'Billing' as access right
- Create a customer invoice
- Add a line, type some text (e.g. 'desk'), then click on 'Search
  more...'

An `AccessError` is raised.

It arises because of this:

https://github.com/odoo/odoo/blob/e2d7cf7898704c82f25556b0b0edb87c05ec5903/addons/mrp/models/product.py#L112

The user has no access to `mrp.bom`, leading to the error.

Since the user has access to stock moves and pickings (thanks to the
rules `access_stock_picking_invoicing_payments` and
`access_stock_move_invoicing_payments`, it makes sense to give him
access to `mrp.bom` and `mrp.bom.line`. Moreover, adding a `sudo` on the
mentioned line could cause issues since `_bom_find` performs a search
which is company dependent.

opw-2089556

closes odoo/odoo#39365

X-original-commit: 59ea1993bc5ddb66675bfc2bff70a626cd14b645
Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>

addons/mrp_account/__manifest__.py

@@ -22,6 +22,7 @@ If the automated inventory valuation is active, the necessary accounting entries
     "init_xml" : [],
     "demo_xml" : [],
     "data": [
+        'security/ir.model.access.csv',
         "views/product_views.xml",
         "views/mrp_production_views.xml",
     ],

addons/mrp_account/security/ir.model.access.csv

@@ -0,0 +1,3 @@
+id,name,model_id:id,group_id:id,perm_read,perm_write,perm_create,perm_unlink
+access_mrp_bom_invoice_bom,mrp.bom,mrp.model_mrp_bom,account.group_account_invoice,1,0,0,0
+access_mrp_bom_line_invoice_bom,mrp.bom.line,mrp.model_mrp_bom_line,account.group_account_invoice,1,0,0,0