Feature: Installation global config (#839) (#840)

* Renamed concern from Feature to Featurable

* Feature: Installation config (#839)
* Added new model installtion config with corresponding migrations and specs
* Created an installation config yml (key value store model)
* Created a config loader module to load the installaltion configs
* Added this to the config loader seeder
* Changed the account before create hook for default feature enabling to use the feature values from installtion config
* Renamed the feature concern to Featurable to follow the naming pattern for concerns
* Added comments and specs for modules and places that deemed necessary

* Refactored config loader to reduce cognitive complexity (#839)

app/models/concerns/featurable.rb

@@ -1,4 +1,4 @@
-module Features
+module Featurable
   extend ActiveSupport::Concern
 
   QUERY_MODE = {
@@ -51,7 +51,10 @@ module Features
   private
 
   def enable_default_features
-    features_to_enabled = FEATURE_LIST.select { |f| f['enabled'] }.map { |f| f['name'] }
+    config = InstallationConfig.find_by(name: 'ACCOUNT_LEVEL_FEATURE_DEFAULTS')
+    return true if config.blank?
+
+    features_to_enabled = config.value.select { |f| f[:enabled] }.map { |f| f[:name] }
     enable_features(features_to_enabled)
   end
 end