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Requirements can be for a project with dependencies, something like
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by having an artificial ExtrasCandidate that wraps the "base" candidate.
The ExtrasCandidate differs from the base in the following ways:
1. It has a unique name, of the form foo[extra]. This causes the resolver
to treat it as a separate node in the dependency graph.
2. When we're getting the candidate's dependencies,
a) We specify that we want the extra dependencies as well.
b) We add a dependency on the base candidate.
See below for why this is needed.
3. We return None for the underlying InstallRequirement, as the base
candidate will provide it, and we don't want to end up with duplicates.
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decide that it should recommend foo[extra1] version 1.0 and foo[extra2]
version 2.0. Having those candidates depend on foo=1.0 and foo=2.0
respectively forces the resolver to recognise that this is a conflict.
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