[BUG] Do not require anonymous authentication

[shurwit]

Describe the bug
Currently when the Auth2 service is initialized, it automatically attempts to authenticate anonymously and throws an error if it is unable to do so. Some applications will not support anonymous auth and will require the user to login as the first step.

To Reproduce
Steps to reproduce the behavior:

1. Set up app/org in Core BB that does not support anonymous auth
2. Run applicaiton that uses plugin Auth2 service
3. See error

Expected behavior
The plugin should either not attempt to use anonymous auth automatically, leaving this up to the application to manage, or should provide some configurations to determine whether or not the application does support anonymous auth.