Feature: Ability to switch between multiple accounts (#881)

* Feature: Ability to switch between multiple accounts

* Fix rubocop

* Fix assigned inboxes

* fix auth json

* Add account switcher in UI

* fix ordering on administrate

* Add switch accounts to sidebar

* add account id

* Fix schema.rb timestamp

* Revert "add account id"

This reverts commit 27570f50ef584cb9a5f69454f43f630b318c8807.

* Add a check for account

Co-authored-by: Pranav Raj Sreepuram <pranavrajs@gmail.com>

db/migrate/20200520125815_add_active_at_to_account_users.rb

@@ -0,0 +1,5 @@
+class AddActiveAtToAccountUsers < ActiveRecord::Migration[6.0]
+  def change
+    add_column :account_users, :active_at, :datetime, default: nil
+  end
+end

db/schema.rb

@@ -34,6 +34,7 @@ ActiveRecord::Schema.define(version: 2020_05_22_115645) do
     t.bigint "inviter_id"
     t.datetime "created_at", precision: 6, null: false
     t.datetime "updated_at", precision: 6, null: false
+    t.datetime "active_at"
     t.index ["account_id", "user_id"], name: "uniq_user_id_per_account_id", unique: true
     t.index ["account_id"], name: "index_account_users_on_account_id"
     t.index ["user_id"], name: "index_account_users_on_user_id"