Extract Class: Implement 'Extract Interface' refactoring

#KT-11017 Fixed

idea/testData/refactoring/extractInterface/addInterface.kt

@@ -0,0 +1,13 @@
+// NAME: X
+// INFO: {checked: "true"}
+interface T {}
+
+open class A
+
+// SIBLING:
+class <caret>B : A(), T {
+    // INFO: {checked: "true"}
+    fun foo() {
+
+    }
+}

idea/testData/refactoring/extractInterface/addInterface.kt.after

@@ -0,0 +1,16 @@
+// NAME: X
+// INFO: {checked: "true"}
+interface T {}
+
+open class A
+
+interface X : T {
+    // INFO: {checked: "true"}
+    fun foo() {
+
+    }
+}
+
+// SIBLING:
+class B : A(), X {
+}

idea/testData/refactoring/extractInterface/addInterfaceWithAbstract.kt

@@ -0,0 +1,13 @@
+// NAME: X
+// INFO: {checked: "true"}
+interface T {}
+
+open class A
+
+// SIBLING:
+class <caret>B : A(), T {
+    // INFO: {checked: "true", toAbstract: "true"}
+    fun foo() {
+
+    }
+}

idea/testData/refactoring/extractInterface/addInterfaceWithAbstract.kt.after

@@ -0,0 +1,18 @@
+// NAME: X
+// INFO: {checked: "true"}
+interface T {}
+
+open class A
+
+interface X : T {
+    // INFO: {checked: "true", toAbstract: "true"}
+    fun foo()
+}
+
+// SIBLING:
+class B : A(), X {
+    // INFO: {checked: "true", toAbstract: "true"}
+    override fun foo() {
+
+    }
+}

idea/testData/refactoring/extractInterface/addTypeParameters.kt

@@ -0,0 +1,14 @@
+// NAME: B
+
+// INFO: {checked: "true"}
+interface I<T>
+
+open class J<T>
+
+// SIBLING:
+class <caret>A<T, U : List<T>, V, W, X> : J<X>(), I<W> {
+    // INFO: {checked: "true"}
+    fun foo(u: U) {
+
+    }
+}

idea/testData/refactoring/extractInterface/addTypeParameters.kt.after

@@ -0,0 +1,17 @@
+// NAME: B
+
+// INFO: {checked: "true"}
+interface I<T>
+
+open class J<T>
+
+interface B<T, U : List<T>, W> : I<W> {
+    // INFO: {checked: "true"}
+    fun foo(u: U) {
+
+    }
+}
+
+// SIBLING:
+class A<T, U : List<T>, V, W, X> : J<X>(), B<T, U, W> {
+}

idea/testData/refactoring/extractInterface/addTypeParametersWithAbstract.kt

@@ -0,0 +1,14 @@
+// NAME: B
+
+// INFO: {checked: "true"}
+interface I<T>
+
+open class J<T>
+
+// SIBLING:
+class <caret>A<T, U : List<T>, V, W, X> : J<X>(), I<W> {
+    // INFO: {checked: "true", toAbstract: "true"}
+    fun foo() {
+        val u: U
+    }
+}

idea/testData/refactoring/extractInterface/addTypeParametersWithAbstract.kt.after

@@ -0,0 +1,19 @@
+// NAME: B
+
+// INFO: {checked: "true"}
+interface I<T>
+
+open class J<T>
+
+interface B<W> : I<W> {
+    // INFO: {checked: "true", toAbstract: "true"}
+    fun foo()
+}
+
+// SIBLING:
+class A<T, U : List<T>, V, W, X> : J<X>(), B<W> {
+    // INFO: {checked: "true", toAbstract: "true"}
+    override fun foo() {
+        val u: U
+    }
+}

idea/testData/refactoring/extractInterface/annotation.kt

@@ -0,0 +1,3 @@
+// NAME: B
+// SIBLING:
+annotation class <caret>A

idea/testData/refactoring/extractInterface/annotation.kt.conflicts

@@ -0,0 +1 @@
+Interface cannot be extracted from an annotation class