feat(core): add loggedIn class

[JoaoPedroAS51]

The goal is to avoid the fetch user request when the user is not logged.

I improved the logged in state adding its own class with get, set and sync methods. This way loggedIn is no longer based on user object. Solving issues related to cookie based overflow.

LoggedIn class can be accessed using $auth.loggedIn:
$auth.loggedIn.get(), $auth.loggedIn.set() and $auth.loggedIn.sync()

I renamed the old method loggedIn to check to avoid conflict. So we can use $auth.check to check if user is logged in or not.

This closes #550 and closes #321

[codecov]

Codecov Report

Merging #556 into dev will not change coverage by %.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               dev      #556   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines            2         2           
=========================================
  Hits             2         2           

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[JoaoPedroAS51]

Closing here in favor of #620