[IMP] models: manage sub companies with check_company

Allow some models to be delegated to the main company of the object.
For instance:
* Have company Parent and Child
* Child has access to all the accounts of Parent
* When creating a document in Child using an account of Parent, there
  shouldn't be a consistency error.

In order to do that, a new method `_check_company_domain` has been added.
This method is used when `check_company=True` is set on the field
declaration to:
* filter relational fields in the UI [^1]
* validate relational fields when writing on them in `create` and `write`

That method should also be used in the business code for models likely
to be shared amongst company branches instead of hardcoding the domain
based on `company_id`.
The same applies on domain restriction on the field declaration: the
flag `check_company` should be prefered instead of providing the domain
explicitly based on `company_id`.

Since a lot of validation and filtering will now be done based on
`parent_of`/`child_of` of the company, some support has been added for
that special case in `filtered_domain` in order to avoid doing
additional queries.

task-3371677

[^1]: because of that change, support has been added on the python
interpreter of the client to allow concatenatng domains.

Part-of: odoo/odoo#125642

odoo/osv/expression.py

@@ -895,6 +895,7 @@ class expression(object):
             """ Return a domain implementing the parent_of operator for [(left,parent_of,ids)],
                 either as a range using the parent_path tree lookup field
                 (when available), or as an expanded [(left,in,parent_ids)] """
+            ids = [id for id in ids if id]  # ignore (left, 'parent_of', [False])
             if not ids:
                 return [FALSE_LEAF]
             left_model = left_model.with_context(active_test=False)