sim:tests: add shodan_stress robot script Script to stress Cantrip and in particular the MemoryManager. To start we sequentially run randomly selected applications. Note this is mostly useful with a release build where there is limited memory and the MemoryManager needs to constantly recycle resources. Bug: 274954207 Change-Id: I06223856e0e652ce86416b70a9d1466a822bb9e1