Add sandbox store plugin type

Moves the sandbox store plugin under the plugins packages and adds a
unique plugin type for other plugins to depend on it.
Updates the sandbox controller plugin to depend on the sandbox store
plugin.

Signed-off-by: Derek McGowan <derek@mcg.dev>

services.go

@@ -166,9 +166,9 @@ func WithIntrospectionService(in introspection.Service) ServicesOpt {
 }
 
 // WithSandboxStore sets the sandbox store.
-func WithSandboxStore(client sandboxapi.StoreClient) ServicesOpt {
+func WithSandboxStore(client sandbox.Store) ServicesOpt {
 	return func(s *services) {
-		s.sandboxStore = proxy.NewSandboxStore(client)
+		s.sandboxStore = client
 	}
 }
 
@@ -191,6 +191,9 @@ func WithInMemoryServices(ic *plugin.InitContext) ClientOpt {
 			plugin.LeasePlugin: func(i interface{}) ServicesOpt {
 				return WithLeasesService(i.(leases.Manager))
 			},
+			plugin.SandboxStorePlugin: func(i interface{}) ServicesOpt {
+				return WithSandboxStore(i.(sandbox.Store))
+			},
 		} {
 			i, err := ic.Get(t)
 			if err != nil {
@@ -228,9 +231,6 @@ func WithInMemoryServices(ic *plugin.InitContext) ClientOpt {
 			srv.IntrospectionService: func(s interface{}) ServicesOpt {
 				return WithIntrospectionClient(s.(introspectionapi.IntrospectionClient))
 			},
-			srv.SandboxStoreService: func(s interface{}) ServicesOpt {
-				return WithSandboxStore(s.(sandboxapi.StoreClient))
-			},
 			srv.SandboxControllerService: func(s interface{}) ServicesOpt {
 				return WithSandboxController(s.(sandboxapi.ControllerClient))
 			},