KT-19126 Add convert property initializer to getter in interfaces (#1224)

idea/testData/quickfix/convertPropertyInitializerToGetter/var.kt

@@ -0,0 +1,8 @@
+// "Convert property initializer to getter" "true"
+// WITH_RUNTIME
+
+fun String.foo() = "bar"
+
+interface A {
+    var name = <caret>"The quick brown fox jumps over the lazy dog".foo()
+}