Expose API for getting installed applications

Expose API for getting installed applications for a specific device when CLI is required as library. Add the new method to `devicesService`.
Add required tests for exposing methods from `devicesService`.

Author: rosen-vladimirov

lib/common

@@ -22,7 +22,10 @@ describe("nativescript-cli-lib", () => {
 		extensibilityService: ["loadExtensions", "loadExtension", "getInstalledExtensions", "installExtension", "uninstallExtension"],
 		liveSyncService: ["liveSync", "stopLiveSync", "enableDebugging", "disableDebugging", "attachDebugger"],
 		debugService: ["debug"],
-		analyticsSettingsService: ["getClientId"]
+		analyticsSettingsService: ["getClientId"],
+		devicesService: ["deployOnDevices", "initialize", "mapAbstractToTcpPort", "getDebuggableApps", "getDebuggableViews",
+			"setLogLevel", "isAppInstalledOnDevices", "isCompanionAppInstalledOnDevices", "getInstalledApplications", "addDeviceDiscovery",
+			"getDevices"]
 	};
 
 	const pathToEntryPoint = path.join(__dirname, "..", "lib", "nativescript-cli-lib.js").replace(/\\/g, "\\\\");