Implement an intention action to move a companion object member to top level

#KT-18828 Fixed

(cherry picked from commit 11f8f8b)

idea/testData/intentions/moveMemberToTopLevel/redeclarationConflictWithPackage.kt

@@ -0,0 +1,8 @@
+// SHOULD_FAIL_WITH: Package 'foo.bar' already contains function f1(Int)
+package foo.bar
+
+object Test {
+    fun <caret>f1(n: Int) {}
+}
+
+fun f1(n: Int) {}