iwyu: it's a wild beast apparently, remove internal includes for now

entt.imp

@@ -39,11 +39,4 @@
   { "include": [ "@[\"<].*/signal/fwd\\.hpp[\">]", "private", "<entt/signal/dispatcher.hpp>", "public" ] },
   { "include": [ "@[\"<].*/signal/fwd\\.hpp[\">]", "private", "<entt/signal/emitter.hpp>", "public" ] },
   { "include": [ "@[\"<].*/signal/fwd\\.hpp[\">]", "private", "<entt/signal/sigh.hpp>", "public" ] },
-  # internal includes
-  { "include": [ "@[\"<].*/entity/sparse_set\\.hpp[\">]", "private", "<entt/entity/storage.hpp>", "public" ] },
-  { "include": [ "@[\"<].*/entity/group\\.hpp[\">]", "private", "<entt/entity/registry.hpp>", "public" ] },
-  { "include": [ "@[\"<].*/entity/mixin\\.hpp[\">]", "private", "<entt/entity/registry.hpp>", "public" ] },
-  { "include": [ "@[\"<].*/entity/sparse_set\\.hpp[\">]", "private", "<entt/entity/registry.hpp>", "public" ] },
-  { "include": [ "@[\"<].*/entity/storage\\.hpp[\">]", "private", "<entt/entity/registry.hpp>", "public" ] },
-  { "include": [ "@[\"<].*/entity/view\\.hpp[\">]", "private", "<entt/entity/registry.hpp>", "public" ] }
 ]