Add raise running task priority test cases

[chinglee-iot]

Adding the functional tests to verify this kernel PR chinglee-iot/FreeRTOS-Kernel#72

Description

• Add test_priority_change_task_high_priority_raise in single priority no timeslice. This test verify that raising the priority of a running task won't alter the idle tasks.
• Add test_priority_change_tasks_equal_priority_raise_additional_task in multiple priority no timeslice. This test verify that raising the priority of a running task won't alter other running tasks.

Filename	--	--	Line Coverage	--	Functions	--	Branches	--
event_groups.c			95.7 %	176 / 184	100.0 %	16 / 16	72.0 %	72 / 100
list.c			100.0 %	40 / 40	100.0 %	5 / 5	100.0 %	6 / 6
queue.c			95.4 %	726 / 761	100.0 %	47 / 47	97.0 %	456 / 470
stream_buffer.c			94.2 %	309 / 328	100.0 %	26 / 26	95.5 %	189 / 198
tasks.c			99.5 %	1461 / 1468	100.0 %	96 / 96	95.1 %	995 / 1046
timers.c			100.0 %	243 / 243	100.0 %	30 / 30	96.2 %	76 / 79

Test Steps

Checklist:

• I have tested my changes. No regression in existing tests.
• I have modified and/or added unit-tests to cover the code changes in this Pull Request.

Related Issue

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.