feat: Add APIs to create custom views on the dashboard (#2498)

db/migrate/20210623150613_create_custom_filters.rb

@@ -0,0 +1,12 @@
+class CreateCustomFilters < ActiveRecord::Migration[6.0]
+  def change
+    create_table :custom_filters do |t|
+      t.string :name, null: false
+      t.integer :filter_type, null: false, default: 0
+      t.jsonb :query, null: false, default: '{}'
+      t.references :account, index: true, null: false
+      t.references :user, index: true, null: false
+      t.timestamps
+    end
+  end
+end