Fix dotted model names (#40745)
* Fix module loading for models with dots in names
* quality check
* added test
* wrong import
* Trigger CI rerun after making test model public
* Update src/transformers/dynamic_module_utils.py
* Update tests/utils/test_dynamic_module_utils.py
* Update tests/utils/test_dynamic_module_utils.py
* Move test
* make fixup
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Co-authored-by: Matt <Rocketknight1@users.noreply.github.com>
Co-authored-by: Matt <rocketknight1@gmail.com>
