feat!: customizable client scopes in oidc_impl package

[kuannie1]

this has the potential to break some dependencies using an unpinned version of this package since it starts with no scopes, but there's a method to add the scopes through its helper function, AddScope

[alexlokshin-czi]

For consistency, let's user camelcase, and rename to formatScopes().

[hspitzley-czi]

Will we always have to add all these scopes manually now? If so, would it be worth adding a function AddDefaultScopes that adds all of these?

[kuannie1]

@hspitzley-czi That was my initial idea, but I'd understand if that's not ideal!

Do you mean adding a function like this to oidc_cli/oidc_impl/client/config_options.go?

var AddDefaultScopes = func(scope string) Option {
	return func(c *Client) {
		c.oauthConfig.Scopes = []string{"openid", "groups", "email", "offline_access"}
	}
}

Or like, adding all the default scopes if none are provided?

[hspitzley-czi]

Yeah like the AddDefaultScopes you defined here! Adding default scopes if none are provided would be nice too if possible, that way it's backwards compatible