Add a couple of accessors (#2774)

Co-authored-by: Olivier Bellone <olivier@bellone.fr>

lib/puma/cluster.rb

@@ -27,6 +27,10 @@ module Puma
       @phased_restart = false
     end
 
+    # Returns the list of cluster worker handles.
+    # @return [Array<Puma::Cluster::WorkerHandle>]
+    attr_reader :workers
+
     def stop_workers
       log "- Gracefully shutting down workers..."
       @workers.each { |x| x.term }

lib/puma/runner.rb

@@ -18,6 +18,10 @@ module Puma
       @wakeup = nil
     end
 
+    # Returns the hash of configuration options.
+    # @return [Puma::UserFileDefaultOptions]
+    attr_reader :options
+
     def wakeup!
       return unless @wakeup