#1069 Pipe pip progress to pipx

[fluzzywuzzy]

• I have added a news fragment under changelog.d/ (if the patch affects the end users)

Summary of changes

Refactor pipx.util.run_subprocess to use subprocess.Popen instead, to let us stream terminal output.
Send captured output stream to pipx.animate.animate and forward to pipx.animate.print_animate where it is included in the printed animation output.

HELP
I am not sucessfull in getting the progress-bars themselves from the pip output. I would appreciate som input on if that is necessary, or if this added information is enough to consider #1069 solved? (It does not pipe progress bars, but the spirit of the issue is that it is dfficult to understand if the installation is stuck or just slow).

If this is sufficient, it should just be a matter of deciding on which with animate calls it should be included.

Test plan

Run pipx install to verify output manually, and make sure all test suites pass.

To test, run:

# pipx install {PACKAGE_NAME}

[fluzzywuzzy]

*Force pushed a commit to overwrite previous with the same name, as replaced commit accidentally deleted file: test_run.py