[Application] Add Application API initial support (getAppInfo/getAppsInfo)

Please check the design doc at:https://docs.google.com/document/d/10rDpiH2E2bSOp0gg3FNK-2eFIetkPygM98utBv-tB3I/edit

As described in the "plan" section, these 2 patches are intended to support ApplicationInformation interface and ApplicationManager.getAppinfo/getAppsInfo API.