Refactor cognitoData to dedicated user/session objects

[mydea]

This splits the functionality/methods up a bit more.

This is a BREAKING CHANGE as it moves the methods around quite a bit. However, migration should be pretty mechanical, doable with search-and-replace:

Changed method locations:

• cognito.restoreAndLoad() remains the same;
• cognito.authenticate() remains the same;
• cognito.authenticateUser() --> cognito.unauthenticated.verifyUserAuthentication()
• cognito.logout() --> remains the same
• cognito.invalidateAccessTokens() --> remains the same
• cognito.triggerResetPasswordMail() --> cognito.unauthenticated.triggerResetPasswordMail()
• cognito.updateResetPassword() --> cognito.unauthenticated.updateResetPassword()
• cognito.setNewPassword() --> cognito.unauthenticated.setInitialPassword()
• cognito.updatePassword() --> cognito.user.updatePassword()
• cognito.updateAttributes() --> cognito.user.updateAttributes()
• cognito.cognitoData.mfa --> cognito.user.mfa
• cognito.cognitoData.cognitoUser --> cognito.user.cognitoUser
• cognito.cognitoData.cognitoUserSession --> cognito.session.cognitoUserSession
• cognito.cognitoData.jwtToken --> cognito.session.jwtToken
• cognito.cognitoData.userAttributes --> cognito.user.userAttributes
• cognito.cognitoData.getAccessToken() --> cognito.session.getAccessToken()
• cognito.cognitoData.getIdToken() --> cognito.session.getIdToken()
• cognito.refreshAccessToken() --> cognito.session.refresh()

cognitoData is no more

As you can see in the above section, cognito.cognitoData has been replaced with cognito.user and cognito.session.

These two properties will be set when the user is authenticated, else they will be undefined. When isAuthenticated === true you can assume they are set.

In contrast, unauthenticated is always available.

Change token auto-refresh

In 4.x, JWT tokens will not be automatically refreshed when they expire.
Instead, you can call cognito.session.enableAutoRefresh() and cognito.session.disableAutoRefresh() to start/stop the auto-refresh background job.

There are also some new/changed methods to work with token refreshing:

cognito.session.refresh();
cognito.session.refreshIfNeeded();
cognito.session.secondsUntilExpires();
cognito.session.needsRefresh();
cognito.session.needsRefreshSoon();

Other changes/news

This also drops the ember-concurrency dependency.