add schema and operations for submit cancellation feedback, along with associated enum

src/schema.gql

@@ -1072,6 +1072,11 @@ type Mutation {
   deleteUser: Boolean!
   createSubscription(priceId: String!): CreateSubscriptionResultGQL!
   cancelSubscription: UserSubscriptionStatusGQL!
+  submitCancellationFeedback(
+    reasons: [CancellationReasonEnum!] = null
+    feedback: String = null
+    metadata: CancellationFeedbackMetadataInput = null
+  ): Boolean!
   findPrerecordTableLayout(b64Image: String!, videoId: Int!): HomographyInfoGQL
   createUploadStream(
     videoMetadata: VideoMetadataInput!
@@ -1196,6 +1201,21 @@ type CreateSubscriptionResultGQL {
   sessionId: String!
 }
 
+enum CancellationReasonEnum {
+  DONT_PLAY_ENOUGH
+  TOO_EXPENSIVE
+  MISSING_FEATURES
+  TECHNICAL_ISSUES
+  DATA_NOT_ACCURATE
+  OTHER
+}
+
+input CancellationFeedbackMetadataInput {
+  appVersion: String = null
+  gitRevision: String = null
+  platform: String = null
+}
+
 type CreateUploadStreamReturn {
   videoId: Int!
 }