feat(gapic-ruby-generator): add tool to stop background process from …

…toys gen

.toys/.toys.rb

@@ -144,6 +144,19 @@ def run
   end
 end
 
+tool "gen stop" do
+  desc "Stops all processes spawned via toys gen"
+
+  def run
+    toys_gen_pids = `ps aux`.each_line.filter_map { |line| line.split[1].to_i if line.match?(/ruby.*protoc/)}
+    puts "No toys gen processes running." if toys_gen_pids.empty?
+    toys_gen_pids.each do |pid|
+        puts "Terminating pid #{pid}"
+        Process.kill("TERM", pid)
+    end
+  end
+end
+
 tool "bin" do
   desc "Regenerates binary input for goldens"