Python-inspector

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- Mock the actual setup provider defined in setup.py.
- Update dependency resolvelib to latest.

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- Update readme with test instructions.
- Fail gracefully at parsing setup.py with no deps.
- Support comments in netrc file 107.

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- Create PyPI cache location in the home directory if a cache directory cannot be made at the project root.
- Replace packaging with packvers.
- Prevent duplicated package versions.

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- Add support for recursive requirements.
- Add python 3.11 as a valid python version in choices.
- Operating system and python version are now required fields in CLI.
- Add dot versions (3.6, 3.7, 3.8, 3.9, 3.10, 3.11, 2.7) with
current python version choices for CLI (36, 37, 38, 39, 310, 311, 27).

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- Make os and python version as mandatory input parameters.
- Do not return duplicates binaries.
- Return empty list for resolved dependencies graph in case of no dependencies
are found 94 https://github.com/nexB/python-inspector/issues/94.

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- Add --prefer-source option, to prefer source packages over binary ones
if no source distribution is available then binary distributions are used.