Add authParams parameter to FusionAuthConfig

[SamBobBarnes]

add authParams param
correct existing documentation

What is this PR and why do we need it?

Currently the login process fails and reports error=invalid_request&error_reason=missing_response_type&error_description=The+request+is+missing+a+required+parameter%3A+response_type when using the SDK on angular and vue #159.

Adding this param allows developers to add the repsonse_type query parameter that is required according to the docs.

Pre-Merge Checklist (if applicable)

• Unit and Feature tests have been added/updated for logic changes, or there is a justifiable reason for not doing so.
  No logic was changed. This parameter was added to a type def and is doing the same as is correspondent in the react sdk.

[kmaida]

Can you please provide repro? Adding an arbitrary authParams parameter is likely avoidable. response_type is an existing parameter on the oauth2/authorize endpoint. However, you wouldn't pass it inside another parameter, you'd include it as a parameter directly on the oauth2/authorize request.

What does your authorization request URI look like?

It should resemble this: http://localhost:9011/oauth2/authorize?client_id={client_id}&redirect_uri={redirect_uri}&response_type=code