debug: analyzer: add support for thread runtime stats

Add thread runtime statistics to the thread analyser.

With CONFIG_THREAD_RUNTIME_STATS enabled:

Booting from ROM..*** Booting Zephyr OS build zephyr-v2.4.0-2330-g77be0e93e65b  ***
thread_a: Hello World from cpu 0 on qemu_x86!
Thread analyze:
 thread_b            : STACK: unused 740 usage 284 / 1024 (27 %); CPU: 0 %
 thread_analyzer     : STACK: unused 8 usage 504 / 512 (98 %); CPU: 0 %
 thread_a            : STACK: unused 648 usage 376 / 1024 (36 %); CPU: 98 %
 idle 00             : STACK: unused 204 usage 116 / 320 (36 %); CPU: 0 %
thread_b: Hello World from cpu 0 on qemu_x86!
thread_a: Hello World from cpu 0 on qemu_x86!
thread_b: Hello World from cpu 0 on qemu_x86!
thread_a: Hello World from cpu 0 on qemu_x86!
thread_b: Hello World from cpu 0 on qemu_x86!
thread_a: Hello World from cpu 0 on qemu_x86!
thread_b: Hello World from cpu 0 on qemu_x86!
thread_a: Hello World from cpu 0 on qemu_x86!
Thread analyze:
 thread_b            : STACK: unused 648 usage 376 / 1024 (36 %); CPU: 7 %
 thread_analyzer     : STACK: unused 8 usage 504 / 512 (98 %); CPU: 0 %
 thread_a            : STACK: unused 648 usage 376 / 1024 (36 %); CPU: 9 %
 idle 00             : STACK: unused 204 usage 116 / 320 (36 %); CPU: 82 %
thread_b: Hello World from cpu 0 on qemu_x86!

Signed-off-by: Anas Nashif <anas.nashif@intel.com>