v1 API camelCase key support

[dunkOnIT]

This PR does the following:

• [x] Converts incoming camelCase to snake_case in the v1 api_controller (with tests asserting behaviour)
• [x] Adds a render_as_camel_case method to the v1 api_controller (with tests asserting behaviour)

Research Findings

Summary

• There aren't any standard Rails-y ways to handle this that I could find (although there are more appropriate ways to do it if we used certain gems which we don't currently use
• But it's pretty easy to roll our own, and that's a common recommendation for our (not uncommon) use case
• Came across two gems that may be of interest to us at some point
  • JBuilder (a DSL for building JSON payloads)
  • active_model_serializers (helps with serializing model objects into JSON, as the name suggests. AFAIK we do this "manually" at the moment, and this gem may make it more dev-friendly

Sources

• https://www.reddit.com/r/rails/comments/10qnxhb/snakecamel_case_conversion_gem/
• https://mnishiguchi-2019.netlify.app/2017/11/29/rails-hash-camelize-and-underscore-keys/
• https://stackoverflow.com/questions/37569439/automatically-convert-hash-keys-to-camelcase-in-jbuilder
• https://discuss.rubyonrails.org/t/rails-with-snakecase-camelcase-conversion-frontend-adapter-pattern/75064/3
• https://stackoverflow.com/questions/1509915/converting-camel-case-to-underscore-case-in-ruby
• Conversation with ChatGPT (which confirmed my general impression from the above sources)