- Remove `_default_log_exceptions` of our `Cursor` class (unused except
in one test)
- Deprecated `serialized` args of `__init__` (Cursor class) and
`cursor()` (of Connection class), our cursor is always serialized.
- Remove `sql_log` attribute of Cursor class and replace it with
appropriate code to do the same stuff dynamically.
- Simplify some code
- Update some docstring
- Clean import
task-2766494
closesodoo/odoo#85078
Signed-off-by: Rémy Voet <ryv@odoo.com>