Support "--launch-args" to add args in launch_cvd command. am: 877df86aab am: 18fe910765 am: 6b3d94d1c8

Original change: https://android-review.googlesource.com/c/platform/tools/acloud/+/1676252

Change-Id: I0ef32925c0109e53d6d0412fb4628fa7cea3c84c