Support push for Live Activity (#668)

* Support push for Live Activity

* Limit Live Activity support to LiveActivityToken field only

As per review feedback, removed all extra Live Activity fields from Aps struct:
- Removed StaleDate, ContentState, Timestamp, Event, DismissalDate, AttributesType, and Attributes fields
- Removed LiveActivityEvent type and constants
- Updated tests to only test LiveActivityToken field
- Kept only the essential LiveActivityToken field in APNSConfig as requested

---------

Co-authored-by: Jonathan Edey <[email protected]>

Author: morikuni

messaging/messaging.go

@@ -664,9 +664,10 @@ type WebpushFCMOptions struct {
 // See https://developer.apple.com/library/content/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/CommunicatingwithAPNs.html
 // for more details on supported headers and payload keys.
 type APNSConfig struct {
-	Headers    map[string]string `json:"headers,omitempty"`
-	Payload    *APNSPayload      `json:"payload,omitempty"`
-	FCMOptions *APNSFCMOptions   `json:"fcm_options,omitempty"`
+	Headers           map[string]string `json:"headers,omitempty"`
+	Payload           *APNSPayload      `json:"payload,omitempty"`
+	FCMOptions        *APNSFCMOptions   `json:"fcm_options,omitempty"`
+	LiveActivityToken string            `json:"live_activity_token,omitempty"`
 }
 
 // APNSPayload is the payload that can be included in an APNS message.

messaging/messaging_test.go

@@ -588,6 +588,21 @@ var validMessages = []struct {
 			"topic": "test-topic",
 		},
 	},
+	{
+		name: "APNSLiveActivity",
+		req: &Message{
+			Token: "test-token",
+			APNS: &APNSConfig{
+				LiveActivityToken: "live-activity-token",
+			},
+		},
+		want: map[string]interface{}{
+			"token": "test-token",
+			"apns": map[string]interface{}{
+				"live_activity_token": "live-activity-token",
+			},
+		},
+	},
 	{
 		name: "AndroidNotificationPriorityMin",
 		req: &Message{