The new command sage --fiximports replaces imports from sage.PAC.KAGE.all by more specific imports when sage.PAC.KAGE is an implicit namespace package.

Part of Meta-ticket #34201

Depends on #34849

CC: @alexchandler100

Component: scripts

Author: Alex Chandler, Matthias Koeppe

Branch/Commit: u/mkoeppe/replace_dot_all @ e74dbf6

Reviewer: Matthias Koeppe, Alex Chandler

Issue created by migration from https://trac.sagemath.org/ticket/34945