DEV: Rename `ServiceRunner` to `Service::Runner` for consistency

lib/service/base.rb

@@ -235,7 +235,7 @@ module Service
 
       def call(context = {}, &actions)
         return new(context).tap(&:run).context unless block_given?
-        ServiceRunner.call(self, context, &actions)
+        Service::Runner.call(self, context, &actions)
       end
 
       def call!(context = {})

lib/service/runner.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 #
-# = ServiceRunner
+# = Service::Runner
 #
 # This class is automatically used when passing a block to the `.call` method
 # of a service. Its main purpose is to ease how actions can be run upon a
@@ -53,7 +53,7 @@
 # only exception to this being +on_failure+ as it will always be executed last.
 #
 
-class ServiceRunner
+class Service::Runner
   # @!visibility private
   AVAILABLE_ACTIONS = {
     on_success: {

spec/lib/service/runner_spec.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-RSpec.describe ServiceRunner do
+RSpec.describe Service::Runner do
   class SuccessService
     include Service::Base
   end