move actor to pkg

pkg/actor/grain_pool.go

@@ -1,6 +1,8 @@
 package actor
 
-import "net/http"
+import (
+	"net/http"
+)
 
 type GrainPool[V any] interface {
 	Apply(id uint64, mutation any) (V, error)
@@ -14,12 +16,19 @@ type GrainPool[V any] interface {
 	GetLocalIds() []uint64
 	RemoveHost(host string)
 	IsHealthy() bool
+	IsKnown(string) bool
 	Close()
 }
 
 // Host abstracts a remote node capable of proxying cart requests.
 type Host interface {
+	AnnounceExpiry(ids []uint64)
+	Negotiate(otherHosts []string) ([]string, error)
 	Name() string
 	Proxy(id uint64, w http.ResponseWriter, r *http.Request) (bool, error)
 	GetActorIds() []uint64
+	Close() error
+	Ping() bool
+	IsHealthy() bool
+	AnnounceOwnership(ids []uint64)
 }