Add debug command to remote access HAL.

Add debug command to test remote access HAL.

Bug: 241483300
Test: Follow:
change file sytem to read-write.
m -j TestWakeupClientServer
adb push
out/target/product/emulator_car64_x86_64/vendor/bin/TestWakeupClientServer
/vendor/bin

In one adb shell:
/vendor/bin/TestWakeupClientServer

In another shell:
dumpsys android.hardware.automotive.remoteaccess.IRemoteAccess/default --start-debug-callback
dumpsys android.hardware.automotive.remoteaccess.IRemoteAccess/default --show-task
[should show no tasks]
dumpsys android.hardware.automotive.remoteaccess.IRemoteAccess/default --ready-for-remote-task 1
[wait for 5s]
dumpsys android.hardware.automotive.remoteaccess.IRemoteAccess/default --show-task
[should see all the tasks from client ID 1]
dumpsys android.hardware.automotive.remoteaccess.IRemoteAccess/default --ready-for-remote-task 0
[wait for 5s]
dumpsys android.hardware.automotive.remoteaccess.IRemoteAccess/default --show-task
[should see no new tasks]
dumpsys android.hardware.automotive.remoteaccess.IRemoteAccess/default
--ready-for-remote-task 1
dumpsys android.hardware.automotive.remoteaccess.IRemoteAccess/default --show-task
[should see new tasks]

Change-Id: I551bf9ab5b55c4de9d8382d69bd5078ec62cad51