Add pyproject.toml file

[shahzebsiddiqui]

This PR will add pyproject.toml to centralize configuration file into one location. With this change we will remove .coveragerc and .isort.cfg.

[codecov]

Codecov Report

Patch coverage: 97.62% and project coverage change: -0.09 ⚠️

Comparison is base (c0d7fe0) 77.97% compared to head (b730a97) 77.88%.

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #1545      +/-   ##
==========================================
- Coverage   77.97%   77.88%   -0.09%     
==========================================
  Files          57       57              
  Lines        6615     6623       +8     
==========================================
  Hits         5158     5158              
- Misses       1457     1465       +8     

Impacted Files	Coverage Δ
buildtest/builders/base.py	89.33% <ø> (ø)
buildtest/buildsystem/checks.py	71.36% <ø> (ø)
buildtest/cli/cdash.py	88.61% <ø> (ø)
buildtest/schemas/utils.py	100.00% <ø> (ø)
buildtest/system.py	54.50% <ø> (ø)
buildtest/cli/buildspec.py	93.87% <87.50%> (ø)
buildtest/buildsystem/parser.py	98.31% <100.00%> (-1.69%)	⬇️
buildtest/cli/__init__.py	100.00% <100.00%> (ø)
buildtest/cli/build.py	95.93% <100.00%> (ø)
buildtest/cli/clean.py	88.57% <100.00%> (ø)
... and 15 more

... and 2 files with indirect coverage changes

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