Updated auth interface (#1384)

* Updated  auth interface

* Add Rule

* Remove Rule

* Return token from Renew

* Renew => Refresh

* Implement Tokens & Default Auth Implementation

* Change default auth to noop

* Change default auth to noop

* Move token.Token to auth.Token

* Remove Token from Account

* Auth service implementation

* Decode JWT locally

* Cookie for secret

* Move string to bottom of interface definition

* Depricate auth_exclude

* Update auth wrappers

* Update go.sum

Co-authored-by: Ben Toogood <ben@micro.mu>

auth/token/token.go

@@ -0,0 +1,23 @@
+package token
+
+import (
+	"errors"
+
+	"github.com/micro/go-micro/v2/auth"
+)
+
+var (
+	// ErrNotFound is returned when a token cannot be found
+	ErrNotFound = errors.New("token not found")
+	// ErrEncodingToken is returned when the service encounters an error during encoding
+	ErrEncodingToken = errors.New("error encoding the token")
+	// ErrInvalidToken is returned when the token provided is not valid
+	ErrInvalidToken = errors.New("invalid token provided")
+)
+
+// Provider generates and inspects tokens
+type Provider interface {
+	Generate(subject string, opts ...GenerateOption) (*auth.Token, error)
+	Inspect(token string) (*auth.Token, error)
+	String() string
+}