Add when branches: include auto-import

Before this commit, enum / sealed class to add was not imported so
user had to import them himself. Now everything is auto-imported.
Separate "add with import" is kept but * import is now in mind there.
#KT-22330 Fixed
#KT-22354 Fixed
EA-108090 Fixed

idea/testData/quickfix/when/addRemainingBranchesAnotherPackage.before.Dependency.kt

@@ -0,0 +1,5 @@
+package e
+
+enum class OwnEnum { RED, GREEN, BLUE }
+
+fun getOwnEnum(): OwnEnum = OwnEnum.RED