RTEMS | Shell: Add PATH and /etc/shadow support (#5424)

[Bhuvan B (@BhuvanB404)]

Bhuvan B created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5424



## Summary

There is a todo mentioned in `login_check.c `desiring an /etc/shadow support to be added to RTEMS

* read hashed passwords from 

  **/etc/shadow** when 

  **`pw_passwd == "x"`**
* Currently denies login in this case

_Currently RTEMS makes /etc/passwd root-only.. Should I still add shadow support for compatibility?_

Path support :

* Search 

  **`$PATH`**  directories when running scripts without a path
* Currently only checks the current working directory

Can I work on these?

Open to suggestions

## Steps to reproduce

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5424
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