Create an ActionView::PathRegistry module

This is a refactor of the `Registry` module added in rails#47347. This is an attempt to
minimize the namespace conflcits that will happen when users will have a top level `Registry` module which can cause
incorrect behavior

Replace ActionView::ViewPaths::Registry with ActionView::PathRegistry

actionpack/lib/action_dispatch/middleware/exception_wrapper.rb

@@ -245,7 +245,7 @@ def spot(exc)
       def build_backtrace
         built_methods = {}
 
-        ActionView::ViewPaths::Registry.all_resolvers.each do |resolver|
+        ActionView::PathRegistry.all_resolvers.each do |resolver|
           resolver.built_templates.each do |template|
             built_methods[template.method_name] = template
           end

actionview/lib/action_view.rb

@@ -40,6 +40,7 @@ module ActionView
     autoload :Helpers
     autoload :LookupContext
     autoload :Layouts
+    autoload :PathRegistry
     autoload :PathSet
     autoload :RecordIdentifier
     autoload :Rendering

actionview/lib/action_view/cache_expiry.rb

@@ -13,7 +13,7 @@ def initialize(watcher:, &block)
         rebuild_watcher
 
         _self = self
-        ActionView::ViewPaths::Registry.singleton_class.set_callback(:build_file_system_resolver, :after) do
+        ActionView::PathRegistry.singleton_class.set_callback(:build_file_system_resolver, :after) do
           _self.send(:rebuild_watcher)
         end
       end
@@ -59,7 +59,7 @@ def dirs_to_watch
         end
 
         def all_view_paths
-          ActionView::ViewPaths::Registry.all_file_system_resolvers.map(&:path)
+          ActionView::PathRegistry.all_file_system_resolvers.map(&:path)
         end
     end
   end

actionview/lib/action_view/lookup_context.rb

@@ -71,7 +71,7 @@ def self.details_cache_key(details)
       end
 
       def self.clear
-        ActionView::ViewPaths::Registry.all_resolvers.each do |resolver|
+        ActionView::PathRegistry.all_resolvers.each do |resolver|
           resolver.clear_cache
         end
         @view_context_class = nil

actionview/lib/action_view/path_registry.rb

@@ -0,0 +1,44 @@
+# frozen_string_literal: true
+
+module ActionView # :nodoc:
+  module PathRegistry # :nodoc:
+    @view_paths_by_class = {}
+    @file_system_resolvers = Concurrent::Map.new
+
+    class << self
+      include ActiveSupport::Callbacks
+      define_callbacks :build_file_system_resolver
+    end
+
+    def self.get_view_paths(klass)
+      @view_paths_by_class[klass] || get_view_paths(klass.superclass)
+    end
+
+    def self.set_view_paths(klass, paths)
+      @view_paths_by_class[klass] = paths
+    end
+
+    def self.file_system_resolver(path)
+      path = File.expand_path(path)
+      resolver = @file_system_resolvers[path]
+      unless resolver
+        run_callbacks(:build_file_system_resolver) do
+          resolver = @file_system_resolvers.fetch_or_store(path) do
+            FileSystemResolver.new(path)
+          end
+        end
+      end
+      resolver
+    end
+
+    def self.all_resolvers
+      resolvers = [all_file_system_resolvers]
+      resolvers.concat @view_paths_by_class.values.map(&:to_a)
+      resolvers.flatten.uniq
+    end
+
+    def self.all_file_system_resolvers
+      @file_system_resolvers.values
+    end
+  end
+end

actionview/lib/action_view/path_set.rb

@@ -67,7 +67,7 @@ def typecast(paths)
         paths.map do |path|
           case path
           when Pathname, String
-            ViewPaths::Registry.file_system_resolver(path.to_s)
+            ActionView::PathRegistry.file_system_resolver(path.to_s)
           when Resolver
             path
           else

actionview/lib/action_view/view_paths.rb

@@ -5,19 +5,19 @@ module ViewPaths
     extend ActiveSupport::Concern
 
     included do
-      ViewPaths::Registry.set_view_paths(self, ActionView::PathSet.new.freeze)
+      ActionView::PathRegistry.set_view_paths(self, ActionView::PathSet.new.freeze)
     end
 
     delegate :template_exists?, :any_templates?, :view_paths, :formats, :formats=,
              :locale, :locale=, to: :lookup_context
 
     module ClassMethods
       def _view_paths
-        ViewPaths::Registry.get_view_paths(self)
+        ActionView::PathRegistry.get_view_paths(self)
       end
 
       def _view_paths=(paths)
-        ViewPaths::Registry.set_view_paths(self, paths)
+        ActionView::PathRegistry.set_view_paths(self, paths)
       end
 
       def _prefixes # :nodoc:
@@ -70,47 +70,6 @@ def local_prefixes
         end
     end
 
-    module Registry # :nodoc:
-      @view_paths_by_class = {}
-      @file_system_resolvers = Concurrent::Map.new
-
-      class << self
-        include ActiveSupport::Callbacks
-        define_callbacks :build_file_system_resolver
-      end
-
-      def self.get_view_paths(klass)
-        @view_paths_by_class[klass] || get_view_paths(klass.superclass)
-      end
-
-      def self.set_view_paths(klass, paths)
-        @view_paths_by_class[klass] = paths
-      end
-
-      def self.file_system_resolver(path)
-        path = File.expand_path(path)
-        resolver = @file_system_resolvers[path]
-        unless resolver
-          run_callbacks(:build_file_system_resolver) do
-            resolver = @file_system_resolvers.fetch_or_store(path) do
-              FileSystemResolver.new(path)
-            end
-          end
-        end
-        resolver
-      end
-
-      def self.all_resolvers
-        resolvers = [all_file_system_resolvers]
-        resolvers.concat @view_paths_by_class.values.map(&:to_a)
-        resolvers.flatten.uniq
-      end
-
-      def self.all_file_system_resolvers
-        @file_system_resolvers.values
-      end
-    end
-
     # The prefixes used in render "foo" shortcuts.
     def _prefixes # :nodoc:
       self.class._prefixes