Auth (#1147)

Implement the Auth interface, with JWT and service implementations.

* Update Auth Interface

* Define Auth Service Implementation

* Support Service Auth

* Add Auth Service Proto

* Remove erronious files

* Implement Auth Service Package

* Update Auth Interface

* Update Auth Interface. Add Validate, remove Add/Remove roles

* Make Revoke interface more explicit

* Refactor serializing and deserializing service accounts

* Fix srv name & update interface to be more explicit

* Require jwt public key for auth

* Rename Variables (Resource.ID => Resource.Name & ServiceAccount => Account)

* Implement JWT Auth Package

* Remove parent, add ID

* Update auth imports to v2. Add String() to auth interface

options.go

@@ -5,6 +5,7 @@ import (
 	"time"
 
 	"github.com/micro/cli/v2"
+	"github.com/micro/go-micro/v2/auth"
 	"github.com/micro/go-micro/v2/broker"
 	"github.com/micro/go-micro/v2/client"
 	"github.com/micro/go-micro/v2/client/selector"
@@ -120,6 +121,13 @@ func Tracer(t trace.Tracer) Option {
 	}
 }
 
+// Auth sets the auth for the service
+func Auth(a auth.Auth) Option {
+	return func(o *Options) {
+		o.Server.Init(server.Auth(a))
+	}
+}
+
 // Selector sets the selector for the service client
 func Selector(s selector.Selector) Option {
 	return func(o *Options) {