Add microdroid debuggerd support

Users can connect to microdroid adb and run debuggerd to see stack trace
of processes. This adds types and permissions for debuggerd. Also this
updates crash_dump so it can now support two types of crash_dump: users
initiating "debuggerd" (sent to microdroid tombstoned) and payloads
crashing (sent to the host vsock server).

Note that tombstoned is still required but it won't be running as
default. Before running debuggerd, users must start tombstoned with
"start tombstoned" inside microdroid.

Bug: 419368848
Test: start tombstoned, and then debuggerd -b $$ inside microdroid
Change-Id: I4791f8f3315e58261ee44ed1367dce7494b2e049