feat: use short tokens as access tokens

The "real" access token will be stored using the short token as key.
This short token will be sent to the clients to be used as access token
for the WOPI server.

This is configurable, and requires a store in order to keep the tokens.

services/collaboration/pkg/server/grpc/option.go

@@ -5,6 +5,7 @@ import (
 
 	"github.com/owncloud/ocis/v2/ocis-pkg/log"
 	"github.com/owncloud/ocis/v2/services/collaboration/pkg/config"
+	microstore "go-micro.dev/v4/store"
 	"go.opentelemetry.io/otel/trace"
 )
 
@@ -19,6 +20,7 @@ type Options struct {
 	Context       context.Context
 	Config        *config.Config
 	TraceProvider trace.TracerProvider
+	Store         microstore.Store
 }
 
 // newOptions initializes the available default options.
@@ -73,3 +75,10 @@ func TraceProvider(val trace.TracerProvider) Option {
 		o.TraceProvider = val
 	}
 }
+
+// Store provides a funtion to set the Store option
+func Store(val microstore.Store) Option {
+	return func(o *Options) {
+		o.Store = val
+	}
+}

services/collaboration/pkg/server/grpc/server.go

@@ -27,6 +27,7 @@ func Server(opts ...Option) (*grpc.Server, func(), error) {
 		svc.Config(options.Config),
 		svc.Logger(options.Logger),
 		svc.AppURLs(options.AppURLs),
+		svc.Store(options.Store),
 	)
 	if err != nil {
 		options.Logger.Error().