[K/JS] Implement an incremental compilation for the per-file granularity

js/js.translator/testData/incremental/invalidation/moveExternalDeclarationsBetweenFiles/main/m.kt

@@ -0,0 +1,7 @@
+fun box(stepId: Int): String {
+    val x = testFunction()
+    if (x != stepId) {
+        return "Fail: $x != $stepId"
+    }
+    return "OK"
+}

js/js.translator/testData/incremental/invalidation/moveExternalDeclarationsBetweenFiles/main/module.info

@@ -0,0 +1,5 @@
+STEP 0:
+    dependencies: lib1, lib2
+    added file: m.kt
+STEP 1..6:
+    dependencies: lib1, lib2