Add a deprecator to SolidQueue module

And include it in the host application's deprecators.

Author: rosa

lib/solid_queue.rb

@@ -69,6 +69,10 @@ def preserve_finished_jobs?
     preserve_finished_jobs
   end
 
+  def deprecator
+    @deprecator ||= ActiveSupport::Deprecation.new(next_major_version, "SolidQueue")
+  end
+
   def instrument(channel, **options, &block)
     ActiveSupport::Notifications.instrument("#{channel}.solid_queue", **options, &block)
   end

lib/solid_queue/engine.rb

@@ -37,5 +37,9 @@ class Engine < ::Rails::Engine
         include ActiveJob::ConcurrencyControls
       end
     end
+
+    initializer "solid_queue.deprecator" do |app|
+      app.deprecators[:solid_queue] = SolidQueue.deprecator
+    end
   end
 end

lib/solid_queue/version.rb

@@ -1,3 +1,7 @@
 module SolidQueue
   VERSION = "1.2.0"
+
+  def self.next_major_version
+    Gem::Version.new(VERSION).segments.first + 1
+  end
 end