This command can be used by the developer to start an empty microdroid
instance to play with. Or to do quick prototyping of their payload code.
Additionally, it can be used by the test infrastructure to run native
tests (e.g. bionic tests) inside the microdroid.
Bug: 254912288
Test: m
Test: adb shell /apex/com.android.virt/bin/vm run-microdroid --debug full
Change-Id: Id7c0e9c046b04d2567ab76fb48c90dbc5ebac803