Fix oauth helper auth style param

This release fixes a bug in the oauth helper that was missing a proper auth style configuration.

Fix nil Login and Logout Redirect URL error message

This release fixes how errors on nil login and logout redirect urls gets sent to the user when using client.InitFromConfig method.

Adds tests and fixes oauth2.getXOAuth2Client bug

This release adds automated unit tests to the oauth package and fixes a bug when calling oauth2.getXOAuth2Client at oauth.go

Adds config check to client.InitFromConfig

This release adds a config check to the client.InitFromConfig, in order to guarantee the config struct is valid when proceeding with the client's initialization.

Client Name and Public URL

To enable a better experience for Whisper's Consent page, whisper-client now offers:

1. a mandatory client-name argument in all it's interfaces: cli, .InitFromParams and .InitFromConfig. This name will substitute the Unknown name from the Consent Page;

2. an optional public-url argument to tall it's interfaces: cli, .InitFromParams and .InitFromConfig. This url will enable the user to click on the app name at the Consent Page and get more info about an app.

This have BREAKING CHANGES with version v0.8.0

Interface improvements

This releases breaking changes to the whisper-client codebase. Namely:

1. --login-redirect-uri is now --login-redirect-url;
2. --logout-redirect-uri is now --logout-redirect-url;

This is for standardization purposes.

Also, client-secret can now be empty, since whisper-client api's can help with a public applications's authorization_code + pkce grant flow.

Fix introspect token

This release fixes the client IntrospectToken api.

Make `code_verifier` and `state` explicit to client apps

This version makes it explicit the management of the code_verifier and state params for the exchange code operation.

Client apps are now required to explicitly manage such information, making this a breaking change.

Add Logout support

This release adds logout support and reviews the exchange token API.

Fix Hydra bug

v0.5.0

Adding url only if it isn't empty