Move JSON data into Python files

[ipmb]

I'm not sure if this is something you want, but it was what got the tests passing for me.

Python packages are weird about installing non-Python files. It requires jumping through some extra hoops in setup.py and MANIFEST.in. It's a pain, so this route seemed easier.

🎉

$ pytest
=================================== test session starts ===================================
platform linux -- Python 3.9.18, pytest-7.3.1, pluggy-1.0.0
rootdir: /home/pete/projects/airpy/airPy
collected 21 items

airpy/tests/test_generate_config.py ....                                            [ 19%]
airpy/tests/test_metric_utils.py ...                                                [ 33%]
airpy/tests/test_processor_modules.py .....                                         [ 57%]
airpy/tests/test_run_airpy.py ..                                                    [ 66%]
airpy/tests/test_utils.py .......                                                   [100%]

=================================== 21 passed in 12.96s ===================================