[issue8668] Packaging: add a 'develop' command

[higery]

higery <shoulderhigher at gmail.com> added the comment:

Through discussing inside or outside the mailing list on this bug tracker, current 'develop' has been made a kind of command other than an action. But there still isn't a consensus of the concrete implemention way, so I keep this command name as 'develop' and the simple usage of this command is :

pysetup run develop

BTW, most developers in this list have agreed that 'develop' is a kind of install command, so I also add an entry funtion 'install_editable' for it, like 'install_local_project' for the 'install_dist' command. In addition, current patch also supports several ways to run the 'develop' which is learned from the source code of install.py. When installing, there are three ways, '_run_packaging_install', '_run_setuptools_install', and '_run_distutils_install', so here for develop command, there are two ways, '_run_packaging_develop' and '_run_setuptools_develop'. You can know more through the source code and docs in this patch.

BTW, should way convert the .egg-info directory to .dist-info directory?

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