RTEMS | Draft: contrib/cpukit: Port microshell to RTEMS (!1063)

[Prashant Rahul (@prashantrahul141)]

Prashant Rahul created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1063

Project:Branches: prashantrahul141/rtems:contrib/microshell to rtems/rtos/rtems:main
Author:   Prashant Rahul



## Summary

Issue: #5312 

This ports microshell as a alternative shell in rtems. This pr is to get initial thoughts and reviews.

There are few things which needs to be clarified/fixed here
1. Microshell build should be conditional, right now it gets build everytime. How exactly should this be setup?

2. Currently `microshell/src/inc/ush_preconfig.h` file includes `"config/ush_config_platform.h"`, that would mean creating a `config` folder inside `$PREFIX/7/arch/board/lib/include` (example: `$PREFIX/7/aarch64-rtems7/zynqmp_qemu_ilp32/lib/include`). Which I have done in the buildspec for microshell, but it seems redundent and I was thinking of instead patching microshell to include something like `"microshell/config/ush_config_platform.h"`. That way `config` folder can be moved inside `microshell` folder which seems "cleaner" to me.

## TODO:
- [ ] conditional build for microshell
- [ ] decide header location
- [ ] DOCS: Existence of microshell inside rtems
- [ ] DOCS: Usage example

## Testing
I have been testing this on sim for the arm/xilinx_zynq_a9_qemu bsp. I am planning to test this real hardware very soon.

## Generative AI

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