report 'trait' keyword as deprecated, provide quickfix for replacing with 'interface'

idea/testData/quickfix/migration/traitToInterface/traitToInterface.kt

@@ -0,0 +1,5 @@
+// "Replace with 'interface'" "true"
+
+<caret>trait Foo {
+
+}

idea/testData/quickfix/migration/traitToInterface/traitToInterface.kt.after

@@ -0,0 +1,5 @@
+// "Replace with 'interface'" "true"
+
+<caret>interface Foo {
+
+}