Add stress test case and some debug symbols

- A test case run_stress_tests.sh with a larger DTO test case
- A flag to test with enabling valgrind
- A flag to dump dtb when testing
- A flag to disable memory pool machanism

Bug: 62474732
Test: tests/run_stress_tests.sh with enabling flags
Change-Id: Ibe4c3d1098bc732d21218e1bdc01eed49cf9e440