Support for androidX orchestrator

[plastiv]

Currently, old support packages are hardcoded

composer/composer/src/main/kotlin/com/gojuno/composer/Main.kt

Lines 131 to 132 in 984b64f

	testPackageName = "android.support.test.orchestrator"
	testRunnerClass = "android.support.test.orchestrator.AndroidTestOrchestrator"

composer/composer/src/main/kotlin/com/gojuno/composer/TestRun.kt

Line 55 in d200b1c

"CLASSPATH=$(pm path android.support.test.services) app_process / android.support.test.services.shellexecutor.ShellMain "

Here is the relevant documentation for androidX orchestrator: https://developer.android.com/training/testing/junit-runner#ato-command-line

Note: currently documentation has a typo. AndroidXTestOrchestrator does not exist and still is called androidx.test.orchestrator.AndroidTestOrchestrator without X.