sorted_imports rule is not caring about different import flavors

[m-revetria]

Imports can declare which kind of type wants to imports, see Import Declaration from Apple Docs. Additionally imports could be marked with @testable.

Personally I'd like having @testable at the end of imports list and grouping imports with kind declaration by kind after normal imports

1. I would expect that next case don't throw.

   import UIKit
   @testable import MyApp

2. I would expect that next case throws

   import AVKit
   import struct MyApp.MyStruct
   import enum MyApp.MyEnum
   import class Foundation.NSArray
   import UIKit

3. Next case would be the valid version of previous case. Actually it is not throwing because sorted_imports rule is case sensitive. I would also expect it to be case insensitive as pointed out in this issue #1185

   import AVKit
   import UIKit
   import class Foundation.NSArray
   import class MyApp.MyClass
   import enum MyApp.MyEnum
   import struct MyApp.MyStruct

4. I would expect next case don't throw

   import AVKit
   import test
   import class Foundation.NSArray
   @testable import MyApp

[stale]

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