This commit adds a new VM for fuzzing starnix.

The VM will boot a fuchsia image using the `ffx` tool and will connect to an adb server inside it. Fuzzing will be done using HostFuzzer mode due to some features not being implemented yet in starnix. Once this is possible, fuzzing will be performed without HostFuzzer mode.

Co-authored-by: Juampi Miceli <jpmiceli@google.com>