add pyproject hatch test environment

[MattShirley]

We are currently using hatch as a build system.

This change allows the user to execute tests in an isolated environment directly from the command line:

hatch run test:test

The old way, where test packages are only set as optional dependencies, requires the user to manually set the environments packages prior to executing tests:

# install test dependencies
pip install -e ".[test]"
hatch run python -m pytest
# uninstall test dependencies
pip install -e .

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.47%. Comparing base (54b5bee) to head (408c235).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #608   +/-   ##
=======================================
  Coverage   96.47%   96.47%           
=======================================
  Files          29       29           
  Lines        1960     1960           
=======================================
  Hits         1891     1891           
  Misses         69       69           

Flag	Coverage Δ
unittests	96.47% <ø> (ø)

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[ponyisi]

I'm happy with it (just, can we confirm the coverage invocation is the same as what the current system does)?