deserialize_callable is not working for local files

[LastRemote]

Describe the bug
deserialize_callable is not working for local files that are not included in sys.modules

Error message

haystack.core.errors.DeserializationError: Could not locate the module of the callable: app.components.c4610c22_3b58_47c2_ba7f_33923bdc662f

Expected behavior
deserialize_callable should respect local imports (from app.components.c4610c22_3b58_47c2_ba7f_33923bdc662f import my_function)

Additional context

To Reproduce
Deserialize a local function using deserialize_callable

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System:
Irrelevant

[anakin87]

Hey!

Can you provide a simple example so that I can reproduce the problem?

[LastRemote]

Can you provide a simple example so that I can reproduce the problem?

@anakin87

mkdir temp
cd temp
echo "def foo(): return 0" >> example_callable.py
echo "from haystack.utils.callable_serialization import deserialize_callable; deserialize_callable('example_callable.foo')" >> test.py
python test.py

This would fail the deserialization (don't use IDEs since they take care of modules and PYTHONPATH automatically)

haystack.core.errors.DeserializationError: Could not locate the module of the callable: example_callable