feat: APIs for Integration Hooks (#2250)

- Introduces JSON Schema validations via JSONSchemer
- Add CRUD APIs for integration hooks

spec/models/integrations/hook_spec.rb

@@ -9,4 +9,22 @@ RSpec.describe Integrations::Hook, type: :model do
   describe 'associations' do
     it { is_expected.to belong_to(:account) }
   end
+
+  describe 'when trying to create multiple hooks for an app' do
+    let(:account) { create(:account) }
+
+    context 'when app allows multiple hooks' do
+      it 'allows to create succesfully' do
+        create(:integrations_hook, account: account, app_id: 'webhook')
+        expect(build(:integrations_hook, account: account, app_id: 'webhook').valid?).to eq true
+      end
+    end
+
+    context 'when app doesnot allow multiple hooks' do
+      it 'throws invalid error' do
+        create(:integrations_hook, account: account, app_id: 'slack')
+        expect(build(:integrations_hook, account: account, app_id: 'slack').valid?).to eq false
+      end
+    end
+  end
 end