Create :burial_module_enabled Flipper

[aplatt-coforma]

Add a flipper :burial_module_enabled to allow us to easily switch between our current setup and the new module

• Update features.yml:

burial_module_enabled:
  actor_type: user
  description: Enables new Burial module
  enable_in_development: true

• Update routes.rb to something like:

 namespace :v0, defaults: { format: 'json' } do
   ...
  if Flipper.enabled?(:burial_module_enabled)
    # Use the new controller from the module folder
    resources :burial_claims, only: %i[create show], controller: 'modules/burials/burial_claims_controller'
  else
    # Use the existing controller
    resources :burial_claims, only: %i[create show], controller: 'v0/burial_claims_controller'
  end
  ...
end