Scratch: implement compiling executor

idea/testData/scratch/custom/MyJavaClass.java

@@ -0,0 +1,7 @@
+package myTest;
+
+public class MyJavaClass {
+    public int test() {
+        return 1;
+    }
+}

idea/testData/scratch/for.comp.after

@@ -0,0 +1,3 @@
+for (i in 0..5) {    // OUTPUT: 0; 1; 2; 3; 4; 5
+    println(i)
+}

idea/testData/scratch/simple.comp.after

@@ -0,0 +1,2 @@
+val a = 1    // RESULT: val a: Int
+a    // RESULT: 1

idea/testData/scratch/simpleFun.comp.after

@@ -0,0 +1,5 @@
+fun foo(): Int {    // RESULT: fun foo(): Int
+    return 1
+}
+
+foo()    // RESULT: 1

idea/testData/scratch/unresolved.comp.after

@@ -0,0 +1 @@
+foo()    // ERROR: Unresolved reference: foo

idea/testData/scratch/userOutput.comp.after

@@ -0,0 +1 @@
+println("hello")    // OUTPUT: hello