add use_streaming flag for elevenlabs and whisper (#290)

* add use_streaming flag for elevenlabs (not for whisper yet)
---------

Co-authored-by: Dave Horton <daveh@beachdognet.com>

lib/routes/api/speech-credentials.js

@@ -133,7 +133,8 @@ const encryptCredential = (obj) => {
     auth_token = '',
     cobalt_server_uri,
     model_id,
-    options
+    options,
+    use_streaming
   } = obj;
 
   switch (vendor) {
@@ -211,7 +212,7 @@ const encryptCredential = (obj) => {
     case 'elevenlabs':
       assert(api_key, 'invalid elevenLabs speech credential: api_key is required');
       assert(model_id, 'invalid elevenLabs speech credential: model_id is required');
-      const elevenlabsData = JSON.stringify({api_key, model_id, options});
+      const elevenlabsData = JSON.stringify({api_key, model_id, options, use_streaming});
       return encrypt(elevenlabsData);
 
     case 'assemblyai':
@@ -413,7 +414,8 @@ router.put('/:sid', async(req, res) => {
           custom_tts_url,
           cobalt_server_uri,
           model_id,
-          options
+          options,
+          use_streaming
         } = req.body;
 
         const newCred = {
@@ -436,7 +438,8 @@ router.put('/:sid', async(req, res) => {
           custom_tts_url,
           cobalt_server_uri,
           model_id,
-          options
+          options,
+          use_streaming
         };
         logger.info({o, newCred}, 'updating speech credential with this new credential');
         obj.credential = encryptCredential(newCred);