Refactor out read_pyproject_toml() and resolve_pyproject_toml().
Refactor out read_pyproject_toml() and resolve_pyproject_toml().

rouge8/pip,xavfernandez/pip,rouge8/pip,pfmoore/pip,sbidoul/pip,pfmoore/pip,pypa/pip,rouge8/pip,xavfernandez/pip,xavfernandez/pip,pradyunsg/pip,sbidoul/pip,pradyunsg/pip,pypa/pip