RTEMS | shell: Refactor variable expansion and PATH search (!918)

[Bhuvan B (@BhuvanB404)]

Bhuvan B created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/918

Project:Branches: BhuvanB404/rtems:path-implementation 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

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/918
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