Add stackprof for profiling

So you can do something like this:

```ruby
  require "stackprof"

  report = StackProf.run(mode: :wall, interval: 100) do
    Account.find_by(external_account_id: 123)
  end

  StackProf::Report.new(report).print_text
```

Gemfile

@@ -41,6 +41,7 @@ gem "useragent", bc: "useragent"
 # Operations
 gem "autotuner"
 gem "mission_control-jobs"
+gem "stackprof"
 gem "benchmark" # indirect dependency, being removed from Ruby 3.5 stdlib so here to quash warnings
 
 group :development, :test do