FEATURE: Create notification schedule to automatically set do not disturb time (#11665)

This adds a new table UserNotificationSchedules which stores monday-friday start and ends times that each user would like to receive notifications (with a Boolean enabled to remove the use of the schedule). There is then a background job that runs every day and creates do_not_disturb_timings for each user with an enabled notification schedule. The job schedules timings 2 days in advance. The job is designed so that it can be run at any point in time, and it will not create duplicate records.

When a users saves their notification schedule, the schedule processing service will run and schedule do_not_disturb_timings. If the user should be in DND due to their schedule, the user will immediately be put in DND (message bus publishes this state).

The UI for a user's notification schedule is in user -> preferences -> notifications. By default every day is 8am - 5pm when first enabled.

spec/requests/users_controller_spec.rb

@@ -1955,6 +1955,38 @@ describe UsersController do
             end
           end
 
+          context "with user_notification_schedule attributes" do
+            it "updates the user's notification schedule" do
+              params = {
+                user_notification_schedule: {
+                  enabled: true,
+                  day_0_start_time: 30,
+                  day_0_end_time: 60,
+                  day_1_start_time: 30,
+                  day_1_end_time: 60,
+                  day_2_start_time: 30,
+                  day_2_end_time: 60,
+                  day_3_start_time: 30,
+                  day_3_end_time: 60,
+                  day_4_start_time: 30,
+                  day_4_end_time: 60,
+                  day_5_start_time: 30,
+                  day_5_end_time: 60,
+                  day_6_start_time: 30,
+                  day_6_end_time: 60,
+                }
+              }
+              put "/u/#{user.username}.json", params: params
+
+              user.reload
+              expect(user.user_notification_schedule.enabled).to eq(true)
+              expect(user.user_notification_schedule.day_0_start_time).to eq(30)
+              expect(user.user_notification_schedule.day_0_end_time).to eq(60)
+              expect(user.user_notification_schedule.day_6_start_time).to eq(30)
+              expect(user.user_notification_schedule.day_6_end_time).to eq(60)
+            end
+          end
+
           context "uneditable field" do
             let!(:user_field) { Fabricate(:user_field, editable: false) }