ImportClassHelper (quick fixes) refactoring

idea/testData/quickfix/typeAddition/beforeNoAddErrorType.kt

@@ -0,0 +1,5 @@
+// "Add return type declaration" "false"
+
+class A() {
+    public val <caret>t = foo()
+}

idea/testData/quickfix/typeImports/afterImportFromAnotherFile.kt

@@ -0,0 +1,9 @@
+// "Add return type declaration" "true"
+
+package a
+
+import b.B
+
+class A() {
+    public val <caret>a : B = b.foo()
+}

idea/testData/quickfix/typeImports/afterNoImportFromTheSameFile.kt

@@ -0,0 +1,7 @@
+// "Add return type declaration" "true"
+
+class A() {}
+
+class B() {
+    public val <caret>a : A = A()
+}

idea/testData/quickfix/typeImports/beforeImportFromAnotherFile.Data.b.kt

@@ -0,0 +1,5 @@
+package b
+
+class B() {}
+
+fun foo() = B()

idea/testData/quickfix/typeImports/beforeImportFromAnotherFile.Main.kt

@@ -0,0 +1,7 @@
+// "Add return type declaration" "true"
+
+package a
+
+class A() {
+    public val <caret>a = b.foo()
+}

idea/testData/quickfix/typeImports/beforeNoImportFromTheSameFile.kt

@@ -0,0 +1,7 @@
+// "Add return type declaration" "true"
+
+class A() {}
+
+class B() {
+    public val <caret>a = A()
+}