Move Execute.Directive to Type.Directive

Just to roughly follow the structure of the reference implementation.

src/Language/GraphQL/Execute/Transform.hs

@@ -19,8 +19,8 @@ import qualified Data.List.NonEmpty as NonEmpty
 import Data.Sequence (Seq, (<|), (><))
 import qualified Language.GraphQL.AST as Full
 import qualified Language.GraphQL.AST.Core as Core
-import qualified Language.GraphQL.Execute.Directive as Directive
 import qualified Language.GraphQL.Schema as Schema
+import qualified Language.GraphQL.Type.Directive as Directive
 
 -- | Associates a fragment name with a list of 'Core.Field's.
 data Replacement = Replacement

src/Language/GraphQL/Type/Directive.hs

@@ -1,6 +1,6 @@
 {-# LANGUAGE OverloadedStrings #-}
 
-module Language.GraphQL.Execute.Directive
+module Language.GraphQL.Type.Directive
     ( selection
     ) where