feat(chatgpt-browser): add support for multiple GPT models

This commit adds support for multiple GPT models in the chatGPT-browser
client. The available models are now stored in a Map object, which maps
the model label to its corresponding model.

The commit adds a new component, ChatGPTOptions, to the client
UI to allow the user to select the GPT model to use in the chat. The
component is only displayed when the chatGPT-browser endpoint is
selected.

api/server/routes/askOpenAI.js

@@ -56,6 +56,7 @@ router.post('/', async (req, res) => {
     });
   }
 
+  // eslint-disable-next-line no-use-before-define
   return await ask({
     userMessage,
     endpointOption,