debug: Add debug_monitor to sniff Debug Info packets

- The debug_monitor monitors Debug Info commands and inform the
  debug_central when it appears.
- The debug_monitor **intercepts** Debug Info events and re-directs them
  to the debug_central for core dump.

Bug: 417589387
Test: run_test.sh --host
Flag: EXEMPT, refactor
Change-Id: Ic257a9cc368e22893bf5b738fea8cc8a020a3757
7 files changed