add operation for hls init link

src/operations/video_upload.gql

@@ -14,6 +14,16 @@ mutation GetUploadLink($videoId: Int!, $segmentIndex: Int!) {
   }
 }
 
+mutation GetHlsInitUploadLink($videoId: Int!) {
+  getHlsInitUploadLink(videoId: $videoId) {
+    uploadUrl
+    headers {
+      key
+      value
+    }
+  }
+}
+
 mutation EditUploadStream(
   $videoId: Int!
   $videoMetadataInput: VideoMetadataInput!