Add wait-for-state command

Disable and enable are async shell command.
This is creating flakyness in test that expect the bluetooth to be
already enabled / disabled.

Test: atest BluetoothInstrumentationTests
Test: atest BluetoothShellCommandTest
Test: atest 'BluetoothTest#AdapterEnableDisable' // net_test_bluetooth
Fix: 261772749
Tag: #refactor
Change-Id: I3ca29dde23a5182ede28eceaf1ac97e4668ab5d5