Add conditional tomllib support for Python 3.11+

[murtazahussainii]

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• I have run the complete test suite to ensure all tests and linters pass.
• I have thoroughly tested my code changes to ensure they work as expected, including adding additional tests for new functionality.
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[jeffwidman]

Thanks, the import changes make sense.

However, for the formatting changes, can you please break them out as a separate PR? Otherwise someone hitting git blame will think those changes are related to tomllib, but they're not. 😃

[jeffwidman]

Also, looks like there might be a test failure, probably tomllib related, but it'll be easier for you to figure out/fix if this PR is scoped to just the tomllib change, and then do the formatting changes (which we're probably open to) in a separate PR

[ulgens]

Wouldn't this require a change in requirements file too?