Added support for authentication using the OAuthPrompt

[Stevenic]

Added a new Authentication class that the Application class uses to automatically call the OAuthPrompt at the start of every turn.

The developer just needs to configure their Application instance with their OAuthPrompt settings.

[rony2818]

Could you have sample for using the OAuthPrompt?
Because when i try to use config OAuthPrompt settings look like this:

const app = new Application<ApplicationTurnState>({
    storage,
    ai: {
        planner,
        promptManager,
        prompt: 'chatGPT'
    },
    authentication: {
        connectionName: process.env.CONNECTION_NAME,
        text: 'Please login',
        title: 'Login',
        timeout: 30000 // User has 5 minutes to login.
    }
});

nothing happens after login

Do I need to do anything more or just OAuthPrompt settings is enough?

[singhk97]

@Stevenic when can we expect this module to be checked in?

[corinagum]

Closing in favor of #670, which is a branch off this PR and has more updates