Adding debug gem (#15459)

See https://github.com/ruby/debug/ for guidance on usage.

Most importantly, this allows for stepping through code.

Gemfile

@@ -141,6 +141,7 @@ group :development, :test do
   gem "bullet", "~> 6.1" # help to kill N+1 queries and unused eager loading
   gem "capybara", "~> 3.36.0" # Capybara is an integration testing tool for rack based web applications
   gem "cypress-rails", github: "forem/cypress-rails", branch: "enable-knapsack-pro-support" # For end to end tests (E2E)
+  gem "debug", ">= 1.0.0" # Provide a debug with step capabilities
   gem "dotenv-rails", "~> 2.7.6" # For loading ENV variables locally
   gem "faker", "~> 2.19" # A library for generating fake data such as names, addresses, and phone numbers
   gem "knapsack_pro", "~> 3.1.3" # Help parallelize Ruby spec builds

Gemfile.lock

@@ -191,6 +191,9 @@ GEM
       msgpack
     dead_end (1.1.7)
     debase-ruby_core_source (0.10.12)
+    debug (1.3.4)
+      irb (>= 1.3.6)
+      reline (>= 0.2.7)
     derailed_benchmarks (2.1.1)
       benchmark-ips (~> 2)
       dead_end
@@ -412,7 +415,10 @@ GEM
     inline_svg (1.7.2)
       activesupport (>= 3.0)
       nokogiri (>= 1.6)
+    io-console (0.5.9)
     ipaddress (0.8.3)
+    irb (1.3.7)
+      reline (>= 0.2.7)
     jbuilder (2.11.3)
       activesupport (>= 5.0.0)
     jquery-fileupload-rails (0.4.7)
@@ -637,6 +643,8 @@ GEM
     redis-store (1.9.0)
       redis (>= 4, < 5)
     regexp_parser (2.1.1)
+    reline (0.2.7)
+      io-console (~> 0.5)
     request_store (1.5.0)
       rack (>= 1.4)
     responders (3.0.1)
@@ -908,6 +916,7 @@ DEPENDENCIES
   counter_culture (~> 3.0)
   cypress-rails!
   ddtrace (~> 0.54.0)
+  debug (>= 1.0.0)
   derailed_benchmarks (~> 2.1)
   devise (~> 4.8)
   devise_invitable (~> 2.0.5)