Move build system to hatchling

[jpdunc23]

• Bumps minimum Python version to 3.8 and minimum Pandas version to 2.0.0.
• Incorporates linting via ruff, black, and isort.
• Expands python-package GitHub workflow to test more OSes and Python version.
• Fixes failing tests and adds new tests.

[codecov]

Codecov Report

Attention: 31 lines in your changes are missing coverage. Please review.

Comparison is base (71d8a28) 85.09% compared to head (ce66fbe) 88.26%.
Report is 4 commits behind head on master.

❗ Current head ce66fbe differs from pull request most recent head 6db4e57. Consider uploading reports for the commit 6db4e57 to get more accurate results

Files	Patch %	Lines
vflow/utils.py	75.00%	5 Missing and 4 partials ⚠️
vflow/vset.py	69.23%	8 Missing ⚠️
vflow/vfunc.py	40.00%	3 Missing and 3 partials ⚠️
vflow/pipeline.py	57.14%	3 Missing ⚠️
tests/test_basic.py	94.11%	0 Missing and 2 partials ⚠️
vflow/helpers.py	92.59%	2 Missing ⚠️
tests/test_pipelines.py	99.13%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #55      +/-   ##
==========================================
+ Coverage   85.09%   88.26%   +3.16%     
==========================================
  Files          12       11       -1     
  Lines        1161     1261     +100     
  Branches        0      245     +245     
==========================================
+ Hits          988     1113     +125     
+ Misses        173       92      -81     
- Partials        0       56      +56     

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