Importlib and hatch

[frank1010111]

Solves #233, going to pure pyproject.toml with a hatch build backend and hatch-vcs for versioning.

Also addresses the issue where pkg_resources doesn't exist, much like in this wellpathpy issue: Zabamund/wellpathpy#70

Not all unit tests pass, but I think that's from the backlog of issues, not introduction of new ones:

============================================================================================= short test summary info ==============================================================================================
FAILED tests/test_curve.py::test_basis_categorical - ValueError: could not convert string to float: 'sand'
FAILED tests/test_location.py::test_empty_location_td - Exception: Please provide an index.
FAILED tests/test_location.py::test_string_location_td - Exception: Please provide an index.
FAILED tests/test_location.py::test_numerical_location_td - Exception: Please provide an index.
FAILED tests/test_project.py::test_df - AttributeError: 'DataFrame' object has no attribute 'iteritems'. Did you mean: 'isetitem'?
FAILED tests/test_well.py::test_well - Exception: Please provide an index.
FAILED tests/test_well.py::test_well_write - Exception: Please provide an index.
FAILED tests/test_well.py::test_df - AttributeError: 'DataFrame' object has no attribute 'iteritems'. Did you mean: 'isetitem'?
============================================================================== 8 failed, 75 passed, 1580 warnings in 73.19s (0:01:13) ==============================================================================