Split SpecifyTypeExplicitly intention into two + refactored them completely

idea/testData/quickfix/createFromUsage/createClass/typeReference/classGroovyTypeReceiver.before.Main.kt

@@ -1,4 +1,5 @@
 // "Create class 'A'" "false"
 // ACTION: Convert to block body
+// ACTION: Remove explicit type specification
 // ERROR: Unresolved reference: A
 fun foo(): J.<caret>A = throw Throwable("")

idea/testData/quickfix/createFromUsage/createClass/typeReference/enumEntryJavaEnumReceiver.before.Main.kt

@@ -1,5 +1,6 @@
 // "Create enum constant 'A'" "false"
 // ACTION: Convert to block body
+// ACTION: Remove explicit type specification
 // ACTION: Create annotation 'A'
 // ACTION: Create class 'A'
 // ACTION: Create enum 'A'