Tests and ci

[trey-stafford]

• Setup pre-commit to do linting/formatting
• Move relevant tool/project config to pyproject.toml
• Setup GitHub Actions workflow for running typechecker (mypy), unit tests, and pre-commit hooks.
• Format existing source files, clean up unused imports, fix missing imports, etc.

Resolved the issue below by merging in Scott's latest changes!

---

Getting a failure in an integration test designed to ensure that this library's implementation of compute_initial_daily_ecdr_dataset return the same result as pm_icecon's:

$ PYTHONPATH=/home/trst2284/code/pm_tb_data/:/home/trst2284/code/pm_icecon python -m pytest -s
================================ test session starts ================================
platform linux -- Python 3.10.12, pytest-7.4.2, pluggy-1.3.0
rootdir: /home/trst2284/code/seaice_ecdr
configfile: pytest.ini
collected 7 items

seaice_ecdr/tests/integration/test_initial_daily_ecdr_generation.py ...F
seaice_ecdr/tests/unit/test_initial_daily_ecdr.py ...

===================================== FAILURES ======================================
__________________ test_seaice_idecdr_and_pmicecon_conc_identical ___________________

sample_pmicecon_dataset = <xarray.Dataset>
Dimensions:  (y: 896, x: 608)
Dimensions without coordinates: y, x
Data variables:
    conc     (y, x) float64 0.0 0.0 0.0 0.0 0.0 0.0 ... 0.0 0.0 0.0 0.0 0.0 0.0
sample_idecdr_dataset = <xarray.Dataset>
Dimensions:                (time: 1, y: 896, x: 608)
Coordinates:
  * time                   (time) i...  missing_value:        255
    time_coverage_start:  2021-04-05 00:00:00
    time_coverage_end:    2021-04-05 23:59:59

    def test_seaice_idecdr_and_pmicecon_conc_identical(
        sample_pmicecon_dataset, sample_idecdr_dataset
    ):
        """Test that pm_icecon yields a 'conc' field."""
        pmicecon_conc_ds = sample_pmicecon_dataset
        pmi_conc_field = np.array(pmicecon_conc_ds.variables['conc'])

        ide_conc_ds = sample_idecdr_dataset
        ide_conc_field = np.squeeze(np.array(ide_conc_ds.variables['conc']))

        # We know that the original conc field has zeros where TBs were not
        # available, so only check where idecdr is not nan
        indexes_to_check = ~np.isnan(ide_conc_field)
>       assert_equal(
            pmi_conc_field[indexes_to_check],
            ide_conc_field[indexes_to_check],
        )
E       AssertionError:
E       Arrays are not equal
E
E       Mismatched elements: 28097 / 544712 (5.16%)
E       Max absolute difference: 94.64499699
E       Max relative difference: 1.
E        x: array([0., 0., 0., ..., 0., 0., 0.])
E        y: array([0., 0., 0., ..., 0., 0., 0.])

seaice_ecdr/tests/integration/test_initial_daily_ecdr_generation.py:98: AssertionError
============================== short test summary info ==============================
FAILED seaice_ecdr/tests/integration/test_initial_daily_ecdr_generation.py::test_seaice_idecdr_and_pmicecon_conc_identical - AssertionError:
============================ 1 failed, 6 passed in 3.96s ============================

This error appears when using this repo's add_qa_field branch and pm_icecon's update_for_nise_cdr_cetb, so I don't think this PR is to blame. Just recording this here until we track down the source of the issue.