RTEMS | contrib: Import libstdthreads from FreeBSD (!1541)

[Ved Gupta (@Ved-Gupta)]

Ved Gupta created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1541

Project:Branches: Ved-Gupta/rtems:libstdthreads/move-to-contrib to rtems/rtos/rtems:main
Author: Ved Gupta

Closes #5779

Hi @joel, this MR moves `libstdthreads` from `cpukit/` into `contrib/` and updates it to the latest upstream FreeBSD version.

## Changes

- **Move**: `cpukit/libstdthreads/` → `contrib/cpukit/libstdthreads/`
- **Update**: All files replaced with latest upstream from freebsd/freebsd-src at 11709058 (`lib/libstdthreads`)
- **New file**: `threads.h` is now included from the upstream source (previously not in the RTEMS tree; the `.c` files now use `#include "threads.h"` instead of `#include <threads.h>`)
- **Supporting updates**: `spec/build/cpukit/librtemscpu.yml`, `CODEOWNERS`, and `contrib/README.md` updated to reflect the new path

## Notable upstream differences

- `SPDX-License-Identifier: BSD-2-Clause` header added to all files
- `cnd.c` and `mtx.c` now use standard `pthread_*` APIs instead of the RTEMS-internal `_Condition_*` / `_Mutex_recursive_*` wrappers — this is the upstream approach and is functionally equivalent since RTEMS implements pthreads
- `thrd_yield()` now calls `pthread_yield()` instead of `sched_yield()`

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1541
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