The goal of this revision is to re-use the environment among the
different steps of the registry loading,
instead of creating a new environment for each step.
1. Simply To avoid to repeat the line
`env = api.Environment(cr, SUPERUSER_ID, {})`
multiple times in the code
2. This also allows to share the context among the different
steps. This is not yet used in this revision, but it could
be, for instance to avoid the current repetition to add the keys
`install_module`, in `convert_csv_import` and `xml_import._tag_record`
Part-of: odoo/odoo#108254
* add tests for uid/context on record & function & root nodes (odoo,
data, openerp) "inherited" by record & function
* add rng validation to the test cases to ensure technical
capabilities are matched by validation capabilities (which was not
the case as we could validate nonsense and import stuff which didn't
pass validation or something)
* extact uid/context into its own rng pattern
- add uid support to record validation
- add uid support to root nodes validation
- fix uid support on function validation: was typoed to @id, which
is not used anywhere in function tags loading & makes no sense
as far as I can tell
* replace get_uid/get_context by get_env & reimplement the whole mess:
build a stack of environments from the root nodes (each root node =
one env in the stack, though the exact same env can be present
multiple times if none of the root nodes has a @uid or @context) and
leaves can build upon this "ready made" environment for their own
uses or use it as-is.
As a result, all uid/context should now properly transfer from the
root nodes to the leaves needing them
* fix support for context on functions: was not actually implemented
as the context was not propagated into the old-style API call
* add uid support to record & context is now inherited from env
Denis Ledoux