refactor: move misc utilities to Util.Extra

Lake/Util/Async.lean

@@ -5,16 +5,10 @@ Authors: Mac Malone
 -/
 import Lake.Util.Task
 import Lake.Util.OptionIO
+import Lake.Util.Misc
 
 namespace Lake
 
-def liftOption [Alternative m] : Option α → m α
-| some a => pure a
-| none => failure
-
-instance [MonadLift m n] : MonadLift (ReaderT ρ m) (ReaderT ρ n) where
-  monadLift x := fun r => liftM <| x r
-
 --------------------------------------------------------------------------------
 -- # Async / Await Abstraction
 --------------------------------------------------------------------------------

Lake/Util/Misc.lean

@@ -0,0 +1,14 @@
+/-
+Copyright (c) 2021 Mac Malone. All rights reserved.
+Released under Apache 2.0 license as described in the file LICENSE.
+Authors: Mac Malone
+-/
+
+namespace Lake
+
+def liftOption [Alternative m] : Option α → m α
+| some a => pure a
+| none => failure
+
+instance [MonadLiftT m n] : MonadLiftT (ReaderT ρ m) (ReaderT ρ n) where
+  monadLift x := fun r => liftM <| x r