Add sidekiq_option for on-conflict-reschedule perform_in time

Add schedule_in sidekiq job option to customize the
on-conflict-reschedule duration of 5 seconds. The default remains 5
seconds if no schedule_in is provided.

lib/sidekiq_unique_jobs/on_conflict/reschedule.rb

@@ -21,7 +21,8 @@ def initialize(item, redis_pool = nil)
       #   This will mess up sidekiq stats because a new job is created
       def call
         if sidekiq_job_class?
-          if job_class.set(queue: item["queue"].to_sym).perform_in(5, *item[ARGS])
+          schedule_in = job_class.get_sidekiq_options["schedule_in"] || 5
+          if job_class.set(queue: item["queue"].to_sym).perform_in(schedule_in, *item[ARGS])
             reflect(:rescheduled, item)
           else
             reflect(:reschedule_failed, item)

spec/sidekiq_unique_jobs/on_conflict/reschedule_spec.rb

@@ -26,6 +26,21 @@
         allow(UniqueJobOnConflictReschedule).to receive(:perform_in).and_call_original
       end
 
+      context "when schedule_in is set to ten seconds" do
+        around do |block|
+          UniqueJobOnConflictReschedule.use_options({ schedule_in: 10 }) do
+            block.call
+          end
+        end
+
+        it "schedules a job ten seconds from now" do
+          expect { call }.to change { schedule_count }.by(1)
+
+          expect(UniqueJobOnConflictReschedule).to have_received(:perform_in)
+            .with(10, *item["args"])
+        end
+      end
+
       it "schedules a job five seconds from now" do
         expect { call }.to change { schedule_count }.by(1)