Move createPayload and sse to data-provider, create TSubmission type

client/src/data-provider/createPayload.ts

@@ -0,0 +1,24 @@
+import type { TSubmission } from './types';
+
+export default function createPayload(submission: TSubmission) {
+  const { conversation, message, endpointOption } = submission;
+  const { conversationId } = conversation;
+  const { endpoint } = endpointOption;
+
+  const endpointUrlMap = {
+    azureOpenAI: '/api/ask/azureOpenAI',
+    openAI: '/api/ask/openAI',
+    bingAI: '/api/ask/bingAI',
+    chatGPTBrowser: '/api/ask/chatGPTBrowser'
+  };
+
+  const server = endpointUrlMap[endpoint];
+
+  let payload = {
+    ...message,
+    ...endpointOption,
+    conversationId
+  };
+
+  return { server, payload };
+}