Make authenticated user data available in page state

[apedroferreira]

Summary

In the same way that we have added authenticated session data to the server context to be used in functions in #3157 (https://mui.com/toolpad/reference/api/get-context/), we could make that same data available in the page state for bindings.

This would be a global property in the page state that would show for every page of a Toolpad app using at least 1 authentication provider.

If no user is logged-in, the session should be null.

Examples

https://docs.retool.com/reference/apps/global/objects/current_user

Motivation

Providing users with more options to easily build their apps around authentication/authorization.

Search keywords: authentication authorization page state session user