Switch from pkg_resources to importlib.metadata #7
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This is a fairly clean swap, but one unintended side effect I noticed is that the "extras" dependencies are now enumerated as runtime dependencies. This is probably the right behavior for a typical "extra", but isn't really right for the "test" extras we use to declare test dependencies because these packages have already been installed and therefore will never need their test dependencies again.
Some refactoring in colcon-core may be able to alleviate this.