Add adb_utils for multidevice test

This commit adds the necessary code for 'adb_utils' to enable APF
multi-device testing which will be introduced in follow-up patches.
This includes utilities of issuing shell command, parsing dumpsys
key-value pairs, controlling doze mode and screen state.

Additionally, unit tests are added to verify the basic functionality.

Test: atest NetworkStaticLibHostPythonTests

Bug: 335368434
Change-Id: I580e91b494580ec9105c8988972845d38c104031
3 files changed