Support Direct URL editable requirements #13495
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This is crucial for the deprecation of non-bare egg URL fragments as they used to be the sole way to request an extra for a VCS editable install.
I've also removed all references to egg fragments from the user docs and added further explanation of the Direct URL form in the VCS support topic.
Getting the error handling right was a pain. That's why I extracted the two parsing flows into their own functions.
Towards #13157.
Towards #1289.
Supersedes #9471.