Record getToken errors in the errors$ observable

[frederikprijck]

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Description

Whenever Auth0Client.getTokenSilently or Auth0Client.getTokenWithPopup throw an error, the AuthService's error$ observable will not record those errors.

This PR ensures it does.

Apart from that, this PR also reworks theAuthHttpInterceptor to use the AuthService instead of the Auth0Client directly, to ensure errors are also recorded as part of the error$ observable when using the interceptor.

References

#103

Testing

When errors are thrown as part of either Auth0Client.getTokenSilentlyor Auth0Client.getTokenWithPopup when calling AuthService.getAccessTokenSilently or AuthService.getAccessTokenWithPopup, the error$ observable should record those errors.

• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not master

[stevehobbsdev]

Generally looks good. Would it also make sense to add a short section under Call an API in the readme to demonstrate how errors should be handled when calling APIs?

Even if the work in this PR doesn't affect how the user would currently handle those errors, I think it would be a worthwhile addition to the docs and makes sense to do it here.