feat(a2a): added a2a protocol (#2784)

* feat(a2a): a2a added

* feat(a2a): added a2a protocol

* remove migrations

* readd migrations

* consolidated permissions utils

* consolidated tag-input, output select -> combobox, added tags for A2A

* cleanup up utils, share same deployed state as other tabs

* ack PR comments

* more

* updated code examples

* solely rely on tanstack query to vend data and invalidate query key's, remove custom caching

---------

Co-authored-by: Emir Karabeg <emirkarabeg@berkeley.edu>

apps/sim/background/a2a-push-notification-delivery.ts

@@ -0,0 +1,33 @@
+import type { TaskState } from '@a2a-js/sdk'
+import { createLogger } from '@sim/logger'
+import { task } from '@trigger.dev/sdk'
+import { deliverPushNotification } from '@/lib/a2a/push-notifications'
+
+const logger = createLogger('A2APushNotificationDelivery')
+
+export interface A2APushNotificationParams {
+  taskId: string
+  state: TaskState
+}
+
+export const a2aPushNotificationTask = task({
+  id: 'a2a-push-notification-delivery',
+  retry: {
+    maxAttempts: 5,
+    minTimeoutInMs: 1000,
+    maxTimeoutInMs: 60000,
+    factor: 2,
+  },
+  run: async (params: A2APushNotificationParams) => {
+    logger.info('Delivering A2A push notification', params)
+
+    const success = await deliverPushNotification(params.taskId, params.state)
+
+    if (!success) {
+      throw new Error(`Failed to deliver push notification for task ${params.taskId}`)
+    }
+
+    logger.info('A2A push notification delivered successfully', params)
+    return { success: true, taskId: params.taskId, state: params.state }
+  },
+})