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)

db/migrate/20200510112339_create_installation_config.rb

@@ -0,0 +1,13 @@
+class CreateInstallationConfig < ActiveRecord::Migration[6.0]
+  def change
+    create_table :installation_configs do |t|
+      t.string :name, null: false
+      t.jsonb :serialized_value, null: false, default: '{}'
+      t.timestamps
+    end
+
+    add_index :installation_configs, [:name, :created_at], unique: true
+
+    ConfigLoader.new.process
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2020_05_09_044639) do
+ActiveRecord::Schema.define(version: 2020_05_10_112339) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "pgcrypto"
@@ -246,6 +246,14 @@ ActiveRecord::Schema.define(version: 2020_05_09_044639) do
     t.index ["account_id"], name: "index_inboxes_on_account_id"
   end
 
+  create_table "installation_configs", force: :cascade do |t|
+    t.string "name", null: false
+    t.jsonb "serialized_value", default: "{}", null: false
+    t.datetime "created_at", precision: 6, null: false
+    t.datetime "updated_at", precision: 6, null: false
+    t.index ["name", "created_at"], name: "index_installation_configs_on_name_and_created_at", unique: true
+  end
+
   create_table "messages", id: :serial, force: :cascade do |t|
     t.text "content"
     t.integer "account_id", null: false
@@ -319,20 +327,6 @@ ActiveRecord::Schema.define(version: 2020_05_09_044639) do
     t.boolean "payment_source_added", default: false
   end
 
-  create_table "super_admins", force: :cascade do |t|
-    t.string "email", default: "", null: false
-    t.string "encrypted_password", default: "", null: false
-    t.datetime "remember_created_at"
-    t.integer "sign_in_count", default: 0, null: false
-    t.datetime "current_sign_in_at"
-    t.datetime "last_sign_in_at"
-    t.inet "current_sign_in_ip"
-    t.inet "last_sign_in_ip"
-    t.datetime "created_at", precision: 6, null: false
-    t.datetime "updated_at", precision: 6, null: false
-    t.index ["email"], name: "index_super_admins_on_email", unique: true
-  end
-
   create_table "taggings", id: :serial, force: :cascade do |t|
     t.integer "tag_id"
     t.string "taggable_type"

db/seeds.rb

@@ -1,3 +1,6 @@
+# loading installation configs
+ConfigLoader.new.process
+
 account = Account.create!(
   name: 'Acme Inc',
   domain: 'support.chatwoot.com',