feat: JWT auth for exotic stream

[wwitzel3]

Add JWT authorization support for the EventBus jetStreamExotic

[whynowy]

Can we introduce a struct to abstract all the auth types, and deprecate the AccessSecret, something like below:

// NatsAuth defines how to authenticate the nats access
type NatsAuth struct {
	// Basic auth which contains a username and a password
	// +optional
	Basic *BasicAuth `json:"basic,omitempty" protobuf:"bytes,1,opt,name=basic"`
	// Token auth
	// +optional
	Token *corev1.SecretKeySelector `json:"token,omitempty" protobuf:"bytes,2,opt,name=token"`
	// NKey auth
	// +optional
	JWT *corev1.SecretKeySelector `json:"jwt,omitempty" protobuf:"bytes,3,opt,name=jwt"`
}

type JetStreamConfig struct {
	// JetStream (Nats) URL
	URL string `json:"url,omitempty" protobuf:"bytes,1,opt,name=url"`
	// Secret for auth
	// +optional
    // Deprecated: Use Auth instead
	AccessSecret *corev1.SecretKeySelector `json:"accessSecret,omitempty" protobuf:"bytes,2,opt,name=accessSecret"`
	// +optional
	StreamConfig string `json:"streamConfig,omitempty" protobuf:"bytes,3,opt,name=streamConfig"`
	// SSL/TLS settings for the NATS client
	// +optional
	TLS *TLSConfig `json:"tls,omitempty" protobuf:"bytes,4,opt,name=tls"`
    Auth *NatsAuth `json:"auth,omitempty" protobuf:"bytes,5,opt,name=auth"`
}

[wwitzel3]

Thank you for the review! I can look into that, it does have a downstream effective requiring a lot of changes since many of other packages currently have logic that checks for and works against the AuthStrategy.