Add heap_dump script

Gemfile

@@ -43,6 +43,8 @@ group :development do
   gem 'binding_of_caller'
   gem 'letter_opener'
   gem 'tunnel'
+  gem 'rbtrace', git: 'https://github.com/tmm1/rbtrace', branch: 'master'
+  gem 'foreman'
 end
 
 group :test, :development do

script/heap_dump.rb

@@ -0,0 +1,6 @@
+Thread.new do
+  require "objspace"
+  ObjectSpace.trace_object_allocations_start
+  GC.start()
+  ObjectSpace.dump_all(output: File.open("heap.json", "w"))
+end.join