Move setup.cfg config settings to pyproject.toml

[david-yz-liu]

Motivation and Context

The Python packaging ecosystem is standardizing on pyproject.toml (PEP 621), and this way we can consolidate all of the project settings in one place. Also Dependabot will scan for dependencies in pyproject.toml but not setup.cfg.

Your Changes

Description: Moved setup.cfg settings into pyproject.toml. Moved nodes/ and sample_usage/ folders into examples to make the package conform to the flat layout.

Type of change (select all that apply):

• Other (please specify): Package configuration and file organization

Testing

Ensured that the package can still be installed with the updated settings.

Questions and Comments (if applicable)

Checklist

• I have performed a self-review of my own code.
• I have verified that the CI tests have passed.
• I have reviewed the test coverage changes reported on Coveralls.

[coveralls]

Pull Request Test Coverage Report for Build 5365525050

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 89.399%

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Totals
Change from base Build 5365146570:	0.02%
Covered Lines:	1771
Relevant Lines:	1981

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💛 - Coveralls