PEP 804: An external dependency registry and name mapping mechanism (#4572)

Co-authored-by: Pradyun Gedam <pradyunsg@gmail.com>
Co-authored-by: rgommers <ralf.gommers@gmail.com>
Co-authored-by: mgorny <mgorny@users.noreply.github.com>
Co-authored-by: Mike Sarahan <msarahan@gmail.com>
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>

Author: 6 people

.github/CODEOWNERS

@@ -679,6 +679,7 @@ peps/pep-0800.rst  @JelleZijlstra
 peps/pep-0801.rst  @warsaw
 peps/pep-0802.rst  @AA-Turner
 peps/pep-0803.rst  @encukou
+peps/pep-0804.rst  @pradyunsg
 # ...
 peps/pep-2026.rst  @hugovk
 # ...