Add unit test for FreeRTOS SMP (#1047)

* Add unit test for FreeRTOS SMP to verify SMP scheduler logic in tasks.c which is enclosed by `configNUMBER_OF_CORES > 1`.

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Co-authored-by: Joshua Zarr <joshzarr@amazon.com>
Co-authored-by: Anubhav Rawal <rawalexe@amazon.com>
Co-authored-by: Alfred Gedeon <alfred2g@hotmail.com>
Co-authored-by: Adam Scislowicz <adamds@amazon.com>
Co-authored-by: jannusi <121577776+jannusi@users.noreply.github.com>
Co-authored-by: Krishna Vamsi Tallapaneni <124737189+vamsitas@users.noreply.github.com>
Co-authored-by: Kody Stribrny <kstribrn@amazon.com>
Co-authored-by: kar-rahul-aws <118818625+kar-rahul-aws@users.noreply.github.com>

.github/.cSpellWords.txt

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@@ -5581,6 +5584,7 @@ lpstart
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