Basic Plaid Integration (#1433)

* Basic plaid data model and linking

* Remove institutions, add plaid items

* Improve schema and Plaid provider

* Add webhook verification sketch

* Webhook verification

* Item accounts and balances sync setup

* Provide test encryption keys

* Fix test

* Only provide encryption keys in prod

* Try defining keys in test env

* Consolidate account sync logic

* Add back plaid account initialization

* Plaid transaction sync

* Sync UI overhaul for Plaid

* Add liability and investment syncing

* Handle investment webhooks and process current day holdings

* Remove logs

* Remove "all" period select for performance

* fix amount calc

* Remove todo comment

* Coming soon for investment historical data

* Document Plaid configuration

* Listen for holding updates

test/interfaces/syncable_interface_test.rb

@@ -0,0 +1,24 @@
+require "test_helper"
+
+module SyncableInterfaceTest
+  extend ActiveSupport::Testing::Declarative
+  include ActiveJob::TestHelper
+
+  test "can sync later" do
+    assert_difference "@syncable.syncs.count", 1 do
+      assert_enqueued_with job: SyncJob do
+        @syncable.sync_later
+      end
+    end
+  end
+
+  test "can sync" do
+    assert_difference "@syncable.syncs.count", 1 do
+      @syncable.sync(start_date: 2.days.ago.to_date)
+    end
+  end
+
+  test "implements sync_data" do
+    assert_respond_to @syncable, :sync_data
+  end
+end