Allow adjustment of logging level

[sverrirarnors]

Allow logging level to be passed to the constructor, see #132

[akaszynski]

Closed/reopened to enable CI to run (hopefully) on external branch.

[akaszynski]

Local testing passes:

==================================== test session starts =====================================
platform linux -- Python 3.11.3, pytest-7.2.2, pluggy-1.0.0
PySide6 6.4.2 -- Qt runtime 6.4.2 -- Qt compiled 6.4.2
rootdir: /home/alex/source/keepa, configfile: pytest.ini
plugins: reverse-1.5.0, anyio-3.6.2, cov-4.0.0, pytest_pyvista-0.1.8, xdist-3.1.0, repeat-0.9.1, qt-4.2.0, hypothesis-6.61.0, memprof-0.2.0, sphinx-0.5.0, asyncio-0.20.3
asyncio: mode=Mode.STRICT
collected 54 items                                                                           

tests/test_async_interface.py .........................                                [ 46%]
tests/test_interface.py .............................                                  [100%]

---------- coverage: platform linux, python 3.11.3-final-0 -----------
Coverage HTML written to dir htmlcov

Required test coverage of 90% reached. Total coverage: 90.18%
========================= 54 passed, 3 warnings in 68.12s (0:01:08) ==========================

Merging. Thanks for your contribution!