added changes to expand textarea with text

[riyasharma-kline]

Motivation and Context
The text box shows only 2-3 lines of data. It should expand to show at least 10-12 lines. Now the textbox gets expanded to show at least 10-12 lines and than a scroll appears.

Description
Before-

Now-

Here is a demo video-
https://github.com/microsoft/sample-app-aoai-chatGPT/assets/150430068/69e56ff4-94a2-47fa-82fa-903588d368b4

Contribution Checklist

• - I have built and tested the code locally and in a deployed app
• - For frontend changes, I have pulled the latest code from main, built the frontend, and committed all static files.
• - This is a change for all users of this app. No code or asset is specific to my use case or my organization.
• - I didn't break any existing functionality 😄

[lawiedc]

Applied changes and worked as expected. Definitely an improvement when handling larger chunks of source data (e.g. when asking for a translation or summary)

[riyasharma-kline]

Hi @sarah-widder, hope you are doing great. Can you please review these changes?