__init__.py added for testing individual files in tests/openai

[zby]

This is needed for running pytest tests/openai/test_modes.py.
Without it I get:

zby@zby-Z4:~/gpt/instructor$ pytest tests/openai/test_modes.py 
====================================================================================================== test session starts ======================================================================================================
platform linux -- Python 3.10.12, pytest-7.4.3, pluggy-1.2.0
rootdir: /home/zby/gpt/instructor
plugins: anyio-3.6.1, asyncio-0.21.1
asyncio: mode=strict
collected 0 items / 1 error                                                                                                                                                                                                     

============================================================================================================ ERRORS =============================================================================================================
__________________________________________________________________________________________ ERROR collecting tests/openai/test_modes.py __________________________________________________________________________________________
ImportError while importing test module '/home/zby/gpt/instructor/tests/openai/test_modes.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
/usr/lib/python3.10/importlib/__init__.py:126: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
tests/openai/test_modes.py:8: in <module>
    from tests.openai.util import models, modes
E   ModuleNotFoundError: No module named 'tests.openai'
==================================================================================================== short test summary info ====================================================================================================
ERROR tests/openai/test_modes.py
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Interrupted: 1 error during collection !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
======================================================================================================= 1 error in 0.07s ========================================================================================================
zby@zby-Z4:~/gpt/instructor$ 

[ellipsis-dev]

Looks good to me!

Summary:

This PR adds an init.py file in the tests/openai directory to resolve a ModuleNotFoundError when running individual test files with pytest.

Key points:

• Added init.py in tests/openai directory to allow individual test files to be run using pytest.

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