fix(redox): file: prefix does not break expansion in ion shell anymore

fix:

replaces prefix "file:" with leading "/" before glob expansion of path. Commands like ls now work on redox os even if the prefix "file:" is before given path.

On redox os commands like

ls file:/*
ls file:*
ls file:home/user

are now equal to

ls /*
ls /*
ls /home/user

On a non redox system the command

ls file:/*

still does not show files unless the name of files are prefixed with "file:/"

Note: something like "file:/*" also work. Reason: "file:" is just stripped in this case because there is already a leading "/".

Addresses issue but does not fix it completely:

redox#1367 (closed)

Covers cases like file:/path/to/everything/, but not cases like disk: not.

test:

Unit tests for checking if "file:" is replaced by leading "/" in path which starts with "file:" are provided.

refactor:

no

docs:

Documented in new chapter for Redox Os in respect to expansion how ion handles the file scheme in a path.

perf:

none