NH-95676: init commit for ruby benchmark

[xuan-cao-swi]

Large chunk of file is rails app code. It can be ignored.
The more interesting part are locust file (how avg response time is calculated) and docker compose file (include how services are setup and configured)

[cheempz]

Wow yes there are a lot of files for the test app, many of what's under the config directory make me concerned, chiefly:

• there are solarwinds initializers containing the service key--we should NEVER commit these even if they are for testing accounts, if these are valid please rotate them immediately.
• config/application.rb has a lot of customization that i'm not sure is actually needed.

You could do a thorough pass through the test application code to clean things out, but i'd prefer the following:

Let's replace the learn-rails app with a freshly generated one. From quick look, learn-rails code is pretty old and not receiving updates, so unless there's some particular reason to use it, this would be preferable:

rails new test-app --minimal --skip-bundle --skip-ci --skip-docker --skip-git

Let's simplify the directory structure so instead of

|_ benchmark
   |_ learn-rails

We have

|_ test-app

and can we remove the README / ab_test* regarding memory overhead test, i don't think we need these anymore.