updates token handling for Azure

[SokolovAnatoliy]

Description of changes

This pull request addresses token management for Azure Open AI tokens. The token is saved to a gptstudio specific directory and ensures that tokens are properly refreshed as needed.

[calderonsamuel]

Thank you for taking the time to contribute!

Some comments:

1. This PR doesn't seem to be linked to an issue, so I have no context on what problem it solves
2. New dependency Microsoft365R should be stated in DESCRIPTION. Using require() in the .onLoad() function seems a bit strange to me. We don't do that for any other package, so I would like to know the reasons.
3. Do you know any programatically way to test that this does what is expected?
4. I'm curious on why you didn't use the full PR template

[JamesHWade]

Tony and I talked about the PR a few days ago (we work together). This does better handling of the Azure token. Before we were generating a token way too often.

[JamesHWade]

Looks good! Let me know if you have any questions.

[calderonsamuel]

Tony and I talked about the PR a few days ago (we work together). This does better handling of the Azure token. Before we were generating a token way too often.

Thanks @JamesHWade , I'll move away from this one then

[SokolovAnatoliy]

Thanks for all your suggestions and comments. I pushed a commit to resolve all of your suggestions.

[JamesHWade]

Thank you for the contribution!