Add wheel build tag to pip list columns output

[ichard26]

Rebased version of #11531 with an update to the news entry and tweaks to the variable names (builds -> build tag). Fixes #5210.

This is how this looks:

Package                       Version         Build
----------------------------- --------------- ------

scripttest                    1.3
setuptools                    75.1.0
six                           1.16.0          1build

If a local editable is installed:

Package                       Version         Editable project location                   Build
----------------------------- --------------- ------------------------------------------- ------
pip                           25.1.dev0       /home/ichard26/dev/oss/pip
scripttest                    1.3
setuptools                    75.1.0
six                           1.16.0                                                      1build

To test this locally, the easiest way is probably to download a wheel, edit its WHEEL metadata file to add a Build: 2imabuildtag field, and install it.

[sbidoul]

Looks good, and useful :)

For completeness, this could also be added to the pip list json output, as well as pip inspect and maybe pip show.

To facilitate that, build_tag could be made a property of BaseDistribution like installer or requested.

These can be done in followup PRs, of course. It would be nice if these are all done in the same pip release cycle, if possible.

[sbidoul]

If a local editable is installed:

If the editable location column is present, it would perhaps look nicer to have the Build column next to Version column.

[ichard26]

If the editable location column is present, it would perhaps look nicer to have the Build column next to Version column.

My thinking was that the build tag is the least important of the four fields shown in the list columns output, thus it should be last... but having looked at the output again, I agree it's better to have the build column next to the version column. Build tags aren't that common AFAIK anyway.