This commit adds esp_backtrace_print_all_tasks() which prints the backtraces
of all tasks at runtime.
Closes https://github.com/espressif/esp-idf/issues/9708
CLoses https://github.com/espressif/esp-idf/pull/11575
[Omar Chebib: Prevent task switching while printing backtraces of tasks.]
[Omar Chebib: Ensure all task stacks are flushed from register to RAM.]
[Omar Chebib: Removed esp_task_snapshot_to_backtrace_frame() as task snapshot is private API.]
[Omar Chebib: Added test case for esp_backtrace_print_all_tasks().]
Signed-off-by: Omar Chebib <omar.chebib@espressif.com>
