RTEMS | shell: Refactor variable expansion and add PATH support (!920)

[Bhuvan B (@BhuvanB404)]

Bhuvan B created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/920

Project:Branches: BhuvanB404/rtems:shell-path to rtems/rtos/rtems:main
Author:   Bhuvan B




## Summary

shell: Refactor variable expansion and PATH search

Improved the RTEMS shell by implementing POSIX-compliant variable expansion and efficient PATH searching.

Follows POSIX standards and uses Dash shell and Bash as reference.

\`\`\`shell

SHLL \[/\] # echo $PATH

SHLL \[/\] # setenv PATH /tmp

SHLL \[/\] # setenv PATH /bin

SHLL \[/\] # setenv PATH $PATH:/tmp

SHLL \[/\] # setenv PATH $PATH:/usr/bin

SHLL \[/\] # ls

app bin dev etc mnt sbin scripts usr

SHLL \[/\] # setenv PATH $PATH:/sbin\
\
SHLL \[/\] # echo $PATH

/bin:/tmp:/usr/bin:/sbin

SHLL \[/\] # ls /bin

myscript

SHLL \[/\] # joel myscript

Hello from script!

PATH test successful

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/920
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