Insert imports in codeFragment correctly. Add test

idea/testData/debugger/insertBeforeExtractFunction/manyImports.kt.after

@@ -0,0 +1,12 @@
+package foo
+
+import a
+import b
+import a
+import b
+
+
+fun main(args: Array<String>) {
+    1 + 1
+println()
+}