[REM] tools: Remove the yml import engine

addons/stock/tests/test_shipment.py

odoo/addons/test_impex/__manifest__.py

odoo/addons/test_impex/tests/test_import_menuitem.yml

odoo/addons/test_impex/tests/test_import_reference.yml

odoo/modules/loading.py

odoo/service/server.py

odoo/tools/__init__.py

odoo/tools/assertion_report.py

odoo/tools/config.py

odoo/tools/convert.py

odoo/tools/test_reports.py

odoo/tools/yaml_import.py

odoo/tools/yaml_tag.py

setup.py