Insert imports on copy/paste

Introduce KotlinCopyPasteReferenceProcessor

idea/testData/copyPaste/imports/ImportedElementCopied.expected.kt

@@ -0,0 +1,22 @@
+package to
+
+class Outer {
+    inner class Inner {
+    }
+    class Nested {
+    }
+    enum class NestedEnum {
+    }
+    object NestedObj {
+    }
+    trait NestedTrait {
+    }
+    annotation class NestedAnnotation
+}
+
+enum class E {
+    ENTRY
+}
+
+fun f2(i: Inner, n: Nested, e: NestedEnum, o: NestedObj, t: NestedTrait, a: NestedAnnotation) {
+}