chore: Add assigned option to conversation finder API (#2630)

- Adds the ability to filter all the conversations which are assigned
- Add rack timeout gem
- Remove size attribute from Sidekiq config

lib/redis/config.rb

@@ -1,16 +1,10 @@
 module Redis::Config
   DEFAULT_SENTINEL_PORT ||= '26379'.freeze
-  SIDEKIQ_SIZE ||= 25
-
   class << self
     def app
       config
     end
 
-    def sidekiq
-      app.merge(size: SIDEKIQ_SIZE)
-    end
-
     def config
       @config ||= sentinel? ? sentinel_config : base_config
     end