Implement JSR223 host in the main-kts jar

also improve diagnostics on configuration instantiation

libraries/tools/kotlin-main-kts-test/test/org/jetbrains/kotlin/mainKts/test/mainKtsJsr223Test.kt

@@ -0,0 +1,26 @@
+import org.jetbrains.kotlin.cli.common.environment.setIdeaIoUseFallback
+import org.junit.Assert
+import org.junit.Test
+import javax.script.ScriptEngineManager
+
+/*
+ * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+class MainKtsJsr223Test {
+
+    init {
+        setIdeaIoUseFallback()
+    }
+
+    @Test
+    fun testSimpleEval() {
+        val engine = ScriptEngineManager().getEngineByExtension("main.kts")!!
+        val res1 = engine.eval("val x = 3")
+        Assert.assertNull(res1)
+        val res2 = engine.eval("x + 2")
+        Assert.assertEquals(5, res2)
+    }
+}
+