Pip-api

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- Expose whether a requirement is editable (131)

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- Use correct long flag for requirements (118)
- Support for hashed requirements (126)
- Drop support for Python 3.6, test against pip==22.0.x (127)

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- Pass PIP_DISABLE_PIP_VERSION_CHECK to all invocations (114)

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- Support the --path parameter when calling pip list (112)

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- Add support for parsing URL requirements (109)
- Test against pip 21.3.1

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- Allow installed_distributions to be filtered for global distributions (103)
- Support Python 3.10
- Test against pip 21.3