Switch from setup.py to pyproject.toml (AR-1624)

[james0209]

Changes

• Transitions away from deprecated setup.py to the new standard pyproject.toml
• Switch from using python setup.py sdist bdist_wheel to python -m build for packaging project
• Combines .pylintrc .yapfignore and pytest.ini config files into the pyproject.toml file
• Remove references to Python 3.6 (3.8 is the current version being used)
• Fix pylint issues that arose from using new version (removing usage of no-self-use - now an optional extension)

How to test your work

Try running pip install utils and pip install -e utils (Editable) from the root repo (workspace). Ensure this installs without any errors

[codecov]

Codecov Report

Merging #1459 (d4fda8e) into main (b1b24fb) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1459   +/-   ##
=======================================
  Coverage   89.84%   89.84%           
=======================================
  Files          17       17           
  Lines         827      827           
=======================================
  Hits          743      743           
  Misses         84       84           

Flag	Coverage Δ
backend	89.84% <ø> (ø)

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[Pasarus]

Same as the last PR! Just fix it up and it's ready for a merge!